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  • 2000-2004  (519)
  • 1890-1899  (195)
  • Schlüsselwörter  (301)
  • Cell & Developmental Biology  (195)
  • MRI  (121)
  • Immunohistochemistry  (100)
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  • 1
    ISSN: 1432-2277
    Schlagwort(e): Key words Liver transplantation ; Rejection ; ICAM-1 ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Acute rejection (AR) is a frequent complication following liver transplantation (LT). ICAM-1 may be involved in its pathogenesis. High doses of glucocorticoids are the standard treatment in these patients. The aim of this study was to describe corticoid effects on ICAM-1 tissue expression in liver biopsies of patients with LT and AR. The study included liver biopsies performed before and after treatment in 12 patients with LT and proven AR. In 10 patients AR was reversible and in 2, was steroid resistant. For immunohistochemistry, an indirect immunoperoxidase technique was used. Each histology section was semiquantitatively evaluated as follows: 0: 〈 10 % staining, 1: 10–25 %, 2: 25–50 %, 3: 〉 50 %. The control group comprised nine patients with LT and normal liver biopsies. In pre-treatment liver biopsy samples, ICAM-1 was markedly expressed on sinusoidal cells (2.41 ± 0.66), and there was also expression on periportal (0.66 ± 0.65) and perivenular hepatocytes (0.83 ± 0.57). By contrast, in the liver tissue from the control group, sinusoidal ICAM-1 reactivity was significantly lower (0.88 ± 0.33; P 〈 0.05), and hepatocytes showed no reliable ICAM-1 expression. After steroid treatment the intensity of ICAM-1 decreased significantly in sinusoids (1.5 ± 0.67; P 〈 0.05) and in perivenular hepatocytes (0.25 ± 0.86; P 〈 0.05). Additionally, we also observed a decreased ICAM-1 reactivity in portal hepatocytes (0.25 ± 0.62), but these differences did not reach statistical significance. Remarkably, after treatment, hepatocytes did not show ICAM-1 reactivity in resolved AR, but in corticoid-resistant patients AR did not change or increase. In conclusion, in patients with LT and AR, ICAM-1 was expressed in hepatocytes and with more intensity in sinusoid cells. Additionally, a down-regulation of the ICAM-1 tissue expression after corticoid treatment may exist, although in corticoid-resistant AR no modulation on ICAM-1 tissue expression was observed.
    Materialart: Digitale Medien
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  • 2
    ISSN: 1432-2307
    Schlagwort(e): Key words Nitric oxide ; Nitric oxide synthase ; Colorectal cancer ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  There is growing evidence that nitric oxide (NO) has an important role in tumor growth. However, information on the expression of NO synthase (NOS) in colorectal cancers is scanty. We therefore investigated the distribution and expression of NOS in human colorectal cancers. The expression of three types of NOS, inducible (iNOS), endothelial (eNOS) and neuronal (nNOS), was examined by immunohistochemistry in 25 cases of colorectal cancer. The expression of iNOS was also investigated at the mRNA level using the reverse transcriptase polymerase chain reaction (RT-PCR) in 6 cases. Correlations were made between iNOS expression and the histopathological findings. Immunoreactive iNOS was detected in the tumor cells in 22 cases (88%) with diffuse cytoplasmic reactions. Expression of iNOS-mRNA detected by RT-PCR in three tumor tissues was over five-fold that in normal mucosa. Intensified immunoreactivity of iNOS was associated with vascular invasion. iNOS expression did not correlate with pathological staging, tumor size, lymph node metastasis, p53 expression or tumor vessel density. Immunoreactive eNOS stained more strongly in the endothelial cells of microvessels within and around the tumor than in the areas remote from the tumor. There is enhanced expression of iNOS and eNOS in human colorectal cancers, which may correlate with tumor growth and vascular invasion.
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Virchows Archiv 436 (2000), S. 131-137 
    ISSN: 1432-2307
    Schlagwort(e): Key words Adhesion molecule ; Integrins ; Meningiomas ; Macrophages ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  This study assessed the expression of leukocyte integrins and macrophage-associated antigens in meningiomas. Fourteen benign meningiomas, ten atypical/anaplastic meningiomas, two hemangiopericytomas and one solitary fibrous tumour (SFT) were included. Frozen sections were immunostained using antibodies directed against leukocyte integrins, CD68, CD14, CD2, CD1a, DRC1 and CD34. Their expression was evaluated semi-quantitatively. Ki67 positive cells were counted. Arachnoid membranes served as controls. Arachnoid cells expressed the β2-integrin subunit and KP1. Beta2 was detected in the tumour cells of 14 meningiomas. In nine cases, this was associated with an α-integrin subunit. There was no statistical difference in the expression of β2 between benign and atypical/anaplastic meningiomas. KP1 was constantly expressed by the tumour cells of meningiomas. It was not expressed by other meningeal tumours. CD34 was detected in the fibrous meningiomas, hemangiopericytomas and the SFT. In each tumour, macrophages were more numerous than T lymphocytes. There was no statistical difference in the density of macrophages and T lymphocytes between the benign and atypical/anaplastic meningiomas. There was no correlation between the Ki67 proliferation index and macrophage infiltration. Meningiomas, through the expression of leukocyte antigens, have a very particular phenotype. The expression of β2 integrins could play a role in the attraction of immunocompetent cells in the stroma of meningiomas.
    Materialart: Digitale Medien
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  • 4
    ISSN: 1432-2307
    Schlagwort(e): Key words Breast ; Adenomyoepithelioma ; Metastasis ; Thyroid ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We describe a patient who was admitted to our hospital with an enlarged left lobe of the thyroid gland. Since fine-needle aspiration showed atypical follicular cells, a surgical exploration followed. Owing to extensive tumor infiltration into the surrounding tissues curative surgery was not possible, and only an incisional biopsy was taken. Histological examination of this biopsy revealed a mixed tumor composed of epithelial and myoepithelial cells. A primary thyroid tumor, metastasis of a salivary gland, and a skin appendage tumor could be excluded based on clinical examination, conventional histology, and immunohistochemistry. A tumor of the left breast treated 12 years earlier had originally been classified as an intraductal/intracystic carcinoma with focal invasion, but was re-examined. Using immunohistochemistry, the breast tumor was reclassified as a malignant adenomyoepithelioma. The current tumor was apparently a metastasis from this primary breast tumor. An updated review of the literature is given, including current knowledge on histological and immunohistochemical features of adenomyoepithelioma of the breast, with special attention to the reported pathological characteristics of recurrent and malignant tumors. Based on the reported pathological characteristics of recurrent and metastatic tumors we offer a diagnostic tool for identifying potentially malignant and recurrent tumors.
    Materialart: Digitale Medien
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  • 5
    ISSN: 1432-2307
    Schlagwort(e): Key words Adenocarcinoma cell ; Mesothelial cells ; Effusions ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  The detection of malignant cells in serous effusions obtained from patients diagnosed with cancer marks the presence of metastatic disease and is associated with a poor outcome. The purpose of this study was to evaluate the role of CD44s and CD44v isoforms in the distinction between mesothelial cells and malignant epithelial cells in effusions. Fifty-nine fresh pleural and peritoneal effusions were studied. These consisted of 41 specimens from patients with known gynecological neoplasms, 9 from patients diagnosed with breast adenocarcinoma, and 9 effusions from patients with various nongynecological malignancies or tumors of unknown origin. Forty-three effusions contained malignant/atypical epithelial cells, and 16 effusions were diagnosed as reactive. Three effusions contained exclusively malignant cells. Specimens were stained with anti-CD44s, v3, v5, v6, v7 and v3-10. The presence of staining in cancer cells, benign mesothelial cells and lymphocytes was evaluated. CD44s immunoreactivity was seen in 10 of 43 (23%) cases in malignant/atypical epithelial cells and in 53 of 56 (94%) cases in benign cells. In contrast, CD44v3-10 was seen in 23 of 43 (55%) cases in malignant/atypical epithelial cells and in 3 of 56 (6%) cases in benign cells. We advocate the use of CD44s and CD44v3-10 immunostaining in diagnostic evaluation of difficult serous effusions.
    Materialart: Digitale Medien
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  • 6
    ISSN: 1432-2307
    Schlagwort(e): Key words Clinical course ; Immunohistochemistry ; Morphology ; Primary gastric T-cell lymphoma
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  In contrast to primary gastric lymphomas of B-cell type, little is known about primary gastric T-cell lymphomas. We describe three cases with remarkably similar features: diffuse growth, epitheliotropism, medium too large cell size, high apoptotic rates, and a CD3+, CD4+, CD8+, CD45RO+ immunophenotype. Clonal TCRγ gene rearrangement was shown in two cases. Epstein-Barr virus infection was excluded in two cases. Taking advantage of fresh-frozen material, we analyzed two cases further, revealing CD5–, CD16+, CD56–, CD57–, CD25+, CD30+, CD103 (αEβ7)+, bcl-2 protein+, CD95+, CD95 ligand(L)–. CD95L, however, was detected in histiocytic and fibroblastoid by stander cells. The lymphomas expressed granzyme B, perforin, and the TIA-1 antigen in various combinations. All three cases had a very unfavorable clinical course characterized by local recurrence and/or dissemination to other epithelial sites, leading to death within 6–12 months after the initial diagnosis despite surgery and aggressive antineoplastic treatment. These data suggest a novel variant of peripheral T-cell lymphoma operationally characterized as primary gastric, apoptosis-rich, CD103+, EBV-, T-cell lymphoma co-expressing CD4, CD8, CD16 and cytotoxic molecules.
    Materialart: Digitale Medien
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  • 7
    ISSN: 1432-2307
    Schlagwort(e): Key words Multifocal micronodular pneumocyte hyperplasia (MMPH) ; Tuberous sclerosis ; Postmenopausal woman ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We report a peculiar case of multifocal micronodular pneumocyte hyperplasia (MMPH) without association of pulmonary lymphangioleiomyomatosis (LAM) in a 56-year-old postmenopausal woman with tuberous sclerosis. This case is surmised to be a forme fruste of tuberous sclerosis. Computed tomography demonstrated multiple micronodules, measuring up to 5 mm in size, present in the bilateral lung fields, but no cystic changes. A proliferation of pleomorphic type-II pneumocytes lining the thickened alveolar septa in an adenomatoid pattern, with an associated increase in alveolar macrophages, was observed without typical nuclear atypia. In fully developed lesions, the ingrowth of more proliferating type-II pneumocytes into the thickened alveolar septa and macrophages filling the alveolar lumens were characteristic findings. Proliferation of immature smooth muscle cells suggesting LAM was not observed. Positive immunohistochemical stains for cytokeratin, epithelial membrane antigen, and surfactant apoproteins A and B, and negative staining for HMB45, alpha-1 smooth muscle actin, desmin, and carcinoembryonic antigen confirmed the characteristics of alveolar lining cells in each MMPH lesion. MMPH associated with tuberous sclerosis in the postmenopausal woman appears to be similar to that described in premenopausal women. The present case is familial rather than sporadic and suggests no relationship between the development of MMPH and the underlying hormonal state.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Virchows Archiv 436 (2000), S. 439-448 
    ISSN: 1432-2307
    Schlagwort(e): Key words Amyloid ; Classification ; Congo red fluorescence ; Early diagnosis ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  In order to find how best to diagnose amyloid deposits as early as possible, the sensitivity of three different methods that can be applied to the diagnosis of amyloid in tissue sections have been compared: the Congo red staining method (CR), the combination of CR and immunocytochemistry (CRIC) and Congo red fluorescence (CRF). Tissue blocks were available from 25 patients, including 11 with immunohistochemically distinct and 3 with chemically undefined amyloid diseases. The results revealed (a) that CRF is more sensitive than either CR or CRIC, as shown qualitatively and quantitatively, (b) that CRF can therefore be utilized to track down even minute amyloid deposits, which can be missed by the other two methods; (c) that the specificity of CRF and CRIC is secured on double-stained sections by the demonstration of green birefringence (GB) of the CRF-marked and IC-marked areas; (d) that CRF can be performed on the spot by just changing the light source; and (e) that CRF is not hampered by the congruent IC chromogen overlay, which ensures the specific classification of the amyloid deposits as applied to different amyloid classes. In conclusion, CRF was demonstrated to be the most sensitive method for direct diagnosis of amyloid in tissue sections. This method can, therefore, allow the earliest diagnosis and classification of amyloid, which is a good basis for an amyloid class-specific therapy while organ damage is still minimal.
    Materialart: Digitale Medien
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  • 9
    ISSN: 1432-2307
    Schlagwort(e): Key words Breast development ; Human breast ; Fetal breast ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Bio-morphological understanding of the developing human mammary glands may clarify some aspects of breast pathology, including cancer. In particular, some epidemiological data suggests that during fetal growth an altered intrauterine hormonal status, especially a change in estrogen status, could predispose to carcinogenesis. In an attempt to achieve new information on early breast growth, a series of developing human breasts have been analyzed, namely: 4 fetal breasts (28–32 weeks of gestational age), 7 infant breasts (7 h to 2 years) and 1 puberal breast (12 years). In addition to the morphological features, we studied the immunohistochemical expression of some markers involved in morphogenesis, such as MIB-1 for cell proliferation, bcl-2 for apoptosis control, CD34 for vasculogenesis, estrogen (ER) and progesterone (PR) receptors for hormonal profile, and smooth-muscle actin for myoepithelial differentiation. The results were as follows: (a) lobules, absent between 28 weeks and 2 days, were well evident at 2 years of age and at puberty; (b) myoepithelial cells appeared from 28 weeks onward and persisted later with no modification in quantity and distribution; (c) epithelial cell proliferation was constantly low; (d) in all breasts inner epithelial cells showed diffuse bcl-2 positivity, while basal myoepithelial-like cells were generally negative; (e) all breasts were well vascularized with two different patterns: periductal vascularization (PDV) and interductal vascularization (IDV), IDV being always present, whereas PDV was found only in infant breasts; (f) ER and PR were almost absent in fetal and infant breasts, while their expression was high in the epithelial cells of the puberal breast; (g) stromal cells had no hormonal receptors and were heterogeneous for proliferation and bcl-2 expression. Interestingly, two fetal breasts showed high proliferation and high ER expression, respectively, in their epithelial compartment. This could be the expression of an altered hormonal environment in utero, representing a basis for possible subsequent cancer initiation.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Virchows Archiv 436 (2000), S. 602-607 
    ISSN: 1432-2307
    Schlagwort(e): Key words Thyroid ; Hashimoto thyroiditis ; Oxyphil cell ; Immunohistochemistry ; bcl-2 ; Bax ; Fas
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Immunoreactivity for bcl-2, Bax and Fas was analysed in 16 cases with Hashimoto thyroiditis. Bcl-2-expression was constantly seen in regular thyrocytes and in the mantle-zone of lymphofollicular infiltrates. However, thyrocytes in the vicinity of lymphoid infiltrates and, especially, mitochondria-rich oxyphil cells exhibited reduced staining or none at all for bcl-2. Bax was found to be weakly reactive or negative in normal thyrocytes and was not up-regulated in bcl-2-deficient epithelial cells. In contrast, expression of Fas was markedly increased both in typical thyrocytes and in oxyphil cells within areas of lymphocytic infiltration. In conclusion, focal lack of bcl-2 expression together with up-regulation of Fas is a constant feature of Hashimoto thyroiditis. The reaction pattern of oxyphil cells is identical to that of affected typical thyrocytes without proliferation of mitochondria. Loss of bcl-2 with up-regulation of Fas is therefore likely to precede oncocytic change. Whether these alterations are involved in the process of oncocytic transformation remains to be clarified, however.
    Materialart: Digitale Medien
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  • 11
    Digitale Medien
    Digitale Medien
    Springer
    Virchows Archiv 436 (2000), S. 628-633 
    ISSN: 1432-2307
    Schlagwort(e): Key words Prostate adenocarcinoma ; Endocrine cells ; Immunohistochemistry ; FSH ; Electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We report an unusual variant of prostatic adenocarcinoma with marked endocrine differentiation (mixed endocrine-exocrine adenocarcinoma). Endocrine cells accounted for 60% of the tumour cells, were positive with silver impregnation and for chromogranin A, synaptophysin, and neuron-specific enolase, and coexpressed the exocrine antigens prostatic acid phosphatase and prostatic-specific antigen. Most of the endocrine cells were basophilic with haematoxylin-eosin and proved immunoreactive for alpha subunit of human chorionic gonadotropin and follicle-stimulating hormone. The remaining endocrine cells were represented by eosinophilic cells positive for serotonin, and by calcitonin and serotonin-immunoreactive cells not identifiable in haematoxylin-eosin-stained sections. On ultrastructural analysis, two types of endocrine cells were identified. The most frequent cell type showed abundant cytoplasmic round, electron-dense neurosecretory granules, either small (212±44 nm) or large (471±114 nm), resembling those of gonadotropic pituitary cells. The second type of endocrine cells contained irregular electron-dense granules similar to those of serotonin-storing enterochromaffin cells.
    Materialart: Digitale Medien
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  • 12
    Digitale Medien
    Digitale Medien
    Springer
    Virchows Archiv 437 (2000), S. 116-121 
    ISSN: 1432-2307
    Schlagwort(e): Key words Oral cancer ; pN upgrading ; Immunohistochemistry ; Micrometastasis ; Semiserial sectioning
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  The International Union Against Cancer (UICC) does not define the number of sections required from each regional lymph node to record pTNM classification. This study was designed to clarify the incidence of occult metastasis and to assess the pN upgrading of patients with oral cancer. Ultimately, this study led to a proposal for appropriate semiserial sectioning guidelines. Five hundred fifty-four nonmetastatic cervical lymph nodes taken from 73 patients with oral cancer were subjected to hematoxylin-eosin (HE) staining and keratin immunohistochemistry. Micrometastases, defined as foci ≤3 mm, were detected in 29 sites of 23 lymph nodes (4.2%) of 16 patients (21.9%). In 9 patients (12.3%) pN upgrading was needed: in 6 from pN0 to pN1, in 1 from pN0 to pN2b, and in 2 from pN1 to pN2b. The remaining 13 lymph nodes with occult metastasis were found in 5 pN2b and 2 pN2c patients, resulting in no pN upgrading. Occult metastasis was also detected in 6 small lymph nodes ≤5 mm in diameter. The average minor axis of the micrometastasis was 1.36±0.85 mm. We propose that the lymph nodes should be cut and examined at 1-mm intervals to detect micrometastatic foci and to evaluate the pN classification accurately.
    Materialart: Digitale Medien
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  • 13
    ISSN: 1432-2307
    Schlagwort(e): Keywords Small round cell tumors ; Ewing’s sarcoma ; Translocation ; Immunohistochemistry ; Differential diagnosis ; RT-PCR
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  It is now widely accepted that the EWS/FLI-1 fusion transcript is associated with tumors of the Ewing family. To test whether it is possible to detect the fusion transcript by means of combining polymerase chain reaction (PCR) methodology and immunohistochemistry, we investigated tumors of the Ewing family using in situ reverse transcriptase (RT)-PCR. We were able to demonstrate the t(11;22) fusion transcript in five of six cases of Ewing’s sarcoma and four of four peripheral primitive neuroectodermal tumors. These results were confirmed using fluorescence in situ hybridization in seven tumor samples. In situ RT-PCR-labeled fusion transcripts were found in virtually all tumor cells within a given sample, indicating that each cell possessed the t(11;22) transcript. We conclude from these results that in situ RT-PCR can be used for the rapid detection of EWS/FLI-1 fusion transcripts in biopsy material. The findings also suggest that all cells of the tumors of the Ewing family carry the EWS/FLI-1 fusion transcript.
    Materialart: Digitale Medien
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  • 14
    ISSN: 1432-2307
    Schlagwort(e): Keywords Gonadotropin-releasing hormone receptor ; Pituitary gland ; Immunohistochemistry ; Colocalization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Gonadotropin-releasing hormone (GnRH), which is a well-known regulator of gonadotroph function, has recently been considered to be a paracrine factor involved in the control of somatotroph, lactotroph, and corticotroph cells. GnRH action is initiated by binding to a specific cell surface receptor, the gonadotropin-releasing hormone receptor (GnRHR), which is expressed by follicle-stimulating hormone/luteinizing hormone (FSH/LH) cells. Using in situ hybridization techniques, GnRHR messenger ribonucleic acid (mRNA) has recently been detected in normal human anterior pituitary gland and in various pituitary adenomas, including FSH/LH-cell, growth hormone (GH)-cell, adrenocorticotropic hormone (ACTH)-cell, and null-cell adenomas. However, immunohistochemical studies indicating the specific cell distribution of GnRHR in normal pituitary cells have never been reported. The aim of the present investigation was to evaluate the immunohistochemical expression of GnRHR in different types of normal pituitary cells and related tumors. Using double-label immunohistochemical techniques on formalin-fixed and paraffin-embedded tissues and specific antibodies directed against pituitary hormones and GnRHR, we found GnRHR immunoreactivity not only in FSH/LH cells, but also in GH- and thyroid-stimulating hormone (TSH) cells. GnRHR was detected in FSH/LH-cell, GH-cell, mixed GH- and prolactin (PRL)-cell, and α-subunit (α-SU)/null-cell adenomas. The findings of this study suggest that the interaction between GnRH and GnRHR may play a role in paracrine/autocrine regulation of different types of normal pituitary cells and pituitary adenomas.
    Materialart: Digitale Medien
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  • 15
    ISSN: 1432-2307
    Schlagwort(e): Keywords CD99 antigen ; Neuroendocrine tumours ; Immunohistochemistry ; Cell-to-cell adhesion ; Proliferative activity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Although considered a specific marker for Ewing’s sarcoma/peripheral neuroectodermal tumour, the MIC2 gene product (CD99) has been immunolocalised in a variety of human tumours. The present study evaluated immunohistochemically the prevalence of CD99 expression in a series of 68 neuroendocrine tumours of different gastrointestinal and pulmonary sites. We now report on membrane and/or granular cytoplasmic immunoreactivity in 25% of these tumours, independent of their anatomical sites. In lung neuroendocrine tumours, CD99 was preferentially confined to typical carcinoids (P=0.009). A statistically significant relationship was observed between the number of CD99 positive cells but not the immunostaining patterns and the presence of local invasion and/or distant metastases (P〈0.001). Moreover, there was a tendency for CD99-reactive tumours to show a reduced proliferative activity expressed by a Ki67 index of 2% (P=0.119). The number of CD99 immunoreactive cells or patterns of immunoreactivity did not correlate with the presence of associated clinical syndrome or particular hormonal immunostaining. Although the molecular basis underlying CD99 expression in neuroendocrine tumours is still poorly understood, our data suggest that CD99 may be involved in cell-to-cell adhesion of neuroendocrine tumour cells and in downregulation of their proliferative activity.
    Materialart: Digitale Medien
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  • 16
    Digitale Medien
    Digitale Medien
    Springer
    Virchows Archiv 437 (2000), S. 445-449 
    ISSN: 1432-2307
    Schlagwort(e): Keywords Solitary fibrous tumour ; Adrenal gland ; Pregnancy ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Solitary fibrous tumour (SFT), first described as a pleural lesion, has been reported in several extrathoracic sites over the past 10 years. We describe a SFT of the left adrenal gland incidentally discovered in a 23-year-old, 22-week pregnant woman and characterised by a rapid growth during the third trimester of pregnancy. Elevated serum and urinary levels of cortisol and elevated blood levels of delta 4 androstendione and 17-OH progesterone were observed. After spontaneous delivery, the patient underwent laparoscopic resectioning of the mass and of the left adrenal gland from which the tumour was apparently originating. The kidney was not involved, and no other abdominal tumours were found. Histological and immunohistochemical features were typical of SFT of pleura and other locations. Only one case of adrenal SFT is on record, and the adrenal gland is to be added to the long list of extrathoracic locations of SFT. The association with pregnancy was a previously unrecognised event in SFT. The focal expression of progesterone receptors in the tumour cells may be related to pregnancy. This observation prompted an analysis of steroid hormone receptors in SFT of classical sites (pleura). Two of five cases had focal progesterone receptors too, a finding which deserves further investigations in a much larger series of SFTs.
    Materialart: Digitale Medien
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  • 17
    ISSN: 1432-2307
    Schlagwort(e): Keywords Non-Hodgkin’s lymphoma ; Immunohistochemistry ; ALK1 ; T-cell lymphoma ; Splenic rupture
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  In a 22-year-old male with a 10-day history of fever, painful swelling in the left groin, and abdominal complaints, emergency surgery was performed because of spontaneous splenic rupture. At histology, a cellular infiltrate of intermediate-sized atypical lymphocytes was seen in the splenic white pulp, staining for T-cell markers. In addition, CD30 and anaplastic lymphoma kinase 1 (ALK) were diffusely positive, thus, representing a case of anaplastic large cell lymphoma (ALCL), T-cell, ALK-positive, small cell monomorphic variant. ALK-positive ALCL patients generally bear a much better prognosis than patients with T-cell lymphomas, unspecified, or ALK-negative ALCL. Therefore, besides the very unusual clinical presentation, this case highlights the importance of immunostaining for CD30 and ALK in all T-cell lymphomas. This report is the first extensive description of ALK-positive ALCL involvement of the spleen.
    Materialart: Digitale Medien
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  • 18
    ISSN: 1432-2161
    Schlagwort(e): Keywords Gaucher disease ; MRI ; Enzyme replacement therapy ; Liver ; Spleen ; Bone marrow
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Purpose. To determine whether T1-weighted magnetic resonance (MR) images can demonstrate response in the marrow of patients with type 1 Gaucher disease treated with enzyme replacement therapy (ERT) and to determine whether a relationship exists between liver and spleen volume reductions and visible marrow changes. Patients. Forty-two patients with type 1 Gaucher disease were evaluated on at least two occasions. Thirty-two patients received ERT. Of these patients, 15 had a baseline examination prior to the initiation of ERT. The remaining 10 patients did not receive ERT. Design. T1-weighted and gradient recalled echo (GRE) coronal images of the femurs and hips were obtained. Concurrently, liver and spleen volumes were determined using contiguous breath-hold axial gradient-echo images. T1-weighted images of the hips and femurs were evaluated to determine change or lack of change in the yellow marrow. Results. Of the 32 patients receiving ERT, 14 (44%) demonstrated increased signal on T1-weighted images suggesting an increase in the amount of yellow marrow. If only the 15 patients with a baseline examination were considered, the response rate to ERT was 67%. Using Student’s t-test a highly significant correlation (P〈0.005) was found between marrow response and reduction in liver and spleen volume. Conclusions. Marrow changes in patients receiving ERT can be detected by T1-weighted images. This response correlated with reductions in visceral volumes (P〈0.0005).
    Materialart: Digitale Medien
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  • 19
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 81-84 
    ISSN: 1432-2161
    Schlagwort(e): Key words Arthrography ; MRI ; Fluoroscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Purpose. To describe a technique for intra-articular injection in the MR suite after conventional fluoroscopic landmarking in order to streamline MR arthrography. Design and patients. This technique was performed on 33 consecutive patients referred for MR arthrography of the shoulder to evaluate the glenoid labrum and on 15 consecutive patients referred for MR arthrography of the hip to evaluate the acetabular labrum. The patients were landmarked in the fluoroscopy suite, followed by a conventional MR examination. The intra-articular injection was then performed on the MR table and the MR arthrographic sequences obtained. Results. One of the 48 injections was extra-articular, requiring a second injection. The other injections were performed without incident, and the average total procedure time for all injections was 10 min. Conclusions. This technique is a reliable method of streamlining intra-articular injections when performing conventional MR imaging prior to the MR arthrographic portion of the examination. It shortens the total MR examination time by eliminating a visit to the fluoroscopy suite in the middle of the MR study, and its use of a straight anterior approach for both the shoulder and hip joints should be familiar to most people who perform conventional arthrography.
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  • 20
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 109-111 
    ISSN: 1432-2161
    Schlagwort(e): Key words Fat ; Elastofibroma ; Neck ; CT ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Elastofibromas are benign lesions of the chest wall. We describe the first reported case of elastofibroma in the neck. Imaging features as well as location of the lesion were atypical. On computed tomography and magnetic resonance imaging the lesion contained a marked preponderance of fat, because the lesion arose within fat.
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  • 21
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 117-124 
    ISSN: 1432-2161
    Schlagwort(e): Key words Osteomalacia ; Metabolic disease ; Hemangiopericytoma ; Fibrohistiocytic tumors ; Radiography ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  The clinical, imaging, metabolic, histologic and biochemical aspects of oncogenic osteomalacia are reviewed. The bone and soft tissue tumor and tumor-like lesions associated with this paraneoplastic syndrome are discussed. The radiologist’s role in the diagnosis and evaluation of this entity is presented.
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  • 22
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 165-167 
    ISSN: 1432-2161
    Schlagwort(e): Key words Rheumatoid arthritis ; Geode ; Pathological fracture ; Humerus ; X-ray ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We describe the imaging features of a giant geode of the distal humerus in a patient with rheumatoid arthritis, which presented initially as a pathological fracture. The value of magnetic resonance imaging in establishing this diagnosis is emphasized.
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  • 23
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 162-164 
    ISSN: 1432-2161
    Schlagwort(e): Key words Retroisthmic cleft ; Stress fracture ; Laminar fracture ; Xray ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  The retroisthmic cleft is a rarely diagnosed defect in the lamina of the lumbar spine. It has always been considered a congenital anomaly. This is the first report we are aware of showing radiological changes in a retroisthmic cleft over a period of time. The follow-up of this patient over a period of 6 years, the radiological and scintigraphic appearances and a review of the literature suggests that the retroisthmic cleft is a stress fracture of the lamina.
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  • 24
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 270-274 
    ISSN: 1432-2161
    Schlagwort(e): Key words Soft tissue neoplasm ; Metastasis ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Objective. To describe a series of patients with no known primary malignancy who presented with a solitary unsuspected soft tissue metastasis masquerading as a soft tissue sarcoma, and secondarily to describe the imaging appearance of these lesions. Design. Records of two academic hospitals with active orthopedic oncology services were reviewed for patients meeting the above criteria. Clinical charts were examined, and the imaging appearance of the soft tissue lesions retrospectively reviewed. Patients. Of 1421 patients examined for soft tissue lesions, 11 were found who met the above criteria. Results. Of the 11 patients whose initial presentation was a solitary soft tissue metastasis, eight were found to have a primary lung cancer, two were diagnosed with adenocarcinoma of unknown primary, and adenocarcinoma of the colon was discovered in the remaining patient. Conclusions. The clinical presentation of a solitary soft tissue metastasis without a known primary malignancy is a rare occurrence, with an incidence of approximately 0.8%. Lung cancer is the primary neoplasm in a high percentage of these cases.
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  • 25
    ISSN: 1432-2161
    Schlagwort(e): Key words Clear cell sarcoma ; Malignant melanoma of soft parts ; MRI ; Magnetic resonance ; Neoplasm
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Objective. To evaluate MR imaging and pathology findings in order to define the characteristic features of clear cell sarcoma of the soft tissues (malignant melanoma of the soft parts). Design and patients. MR examinations of 21 patients with histologically proven clear cell sarcoma of the musculoskeletal system were retrospectively reviewed and assessed for shape, homogeneity, delineation, signal intensities on T1- and T2-weighted images, contrast enhancement, relationship with adjacent fascia or tendon, secondary bone involvement, and intratumoral necrosis. In 19 cases the pathology findings were available for review and for a comparative MR-pathology study. Results. On T1-weighted images, lesions were isointense (n=3), hypointense (n=7) or slightly hyperintense to muscle (n=11). Immunohistochemical examination was performed in 17 patients. All 17 specimens showed positivity for HMB-45 antibody. In nine of 11 lesions with slightly increased signal intensity on T1-weighted images, a correlative MR imaging-pathology study was possible. All nine were positive to HMB-45 antibody. Conclusions. Clear cell sarcoma of the musculoskeletal system often has a benign-looking appearance on MR images. In up to 52% of patients, this lesion with melanocytic differentiation has slightly increased signal intensity on T1-weighted images compared with muscle. As the presence of this relative higher signal intensity on T1-weighted images is rather specific for tumors displaying melanocytic differentiation, radiologists should familiarize themselves with this rare entity and include it in their differential diagnosis when confronted with a well-defined, homogeneous, strongly enhancing mass with slightly higher signal intensity compared with muscle on native T1-weighted images.
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  • 26
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 227-230 
    ISSN: 1432-2161
    Schlagwort(e): Key words Erdheim-Chester Disease ; Lipogranuloma ; MRI ; Muscle ; Rectus femoris
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We report on a rare manifestation of Erdheim-Chester disease with intramuscular lipogranuloma. The patient was a 66-year-old man who noted a soft tissue mass in the right quadriceps femoris muscle. Radiographs revealed symmetrical osteosclerosis in the diametaphysis of both femora and tibiae. An open biopsy revealed a proliferation of lipid-laden histiocytes in the femoral bone marrow and the quadriceps femoris muscle. To our knowledge, this is the second case of Erdheim-Chester disease involving muscle.
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  • 27
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 235-238 
    ISSN: 1432-2161
    Schlagwort(e): Key words Femur echinococcosis ; MRI ; echinococcosis ; Hydatid cyst surgery ; Hydatid cyst ; anticestodal
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Magnetic resonance (MR) findings of a rare case of osseous echinococcosis with involvement of the femur are described. Attention is drawn to the typical MR appearances and therapeutic management.
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  • 28
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 243-246 
    ISSN: 1432-2161
    Schlagwort(e): Key words Tibial deficiency ; Fibular deficiency ; Congenital hip dislocation ; Transverse limb deficiency ; X-ray ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We report two similar, but unrelated, patients with congenital bilateral partial deficiencies of the tibia and fibula associated with intact feet. In both patients, the tibia and fibula were absent on initial radiographs, while the femur and the tarsal bones were well developed and there was bilateral teratologic dislocation of the hips. Ultrasound and magnetic resonance imaging (MRI) studies suggested the presence of cartilaginous remnants of the tibia and fibula. There were multidirectional instabilities in the knees and ankles. The clinical and radiological features of these cases are distinct from those of congenital longitudinal deficiency of the tibia, in which the fibula is always preserved, and from longitudinal deficiency of the fibula, in which the tibia is present and the foot is usually involved. We suggest that the bilateral partial deficiencies of the tibia and fibula associated with the intact foot and teratologic dislocation of the hips is a single-entity disorder, possibly categorized as an intercalary transverse deficiency of the lower limb.
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  • 29
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 1-9 
    ISSN: 1432-2161
    Schlagwort(e): Key words Soft tissue masses ; Hemorrhage ; MRI ; Iron ; Contrast enhancement, MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Hematomas in the extremities can present clinically as a soft tissue mass. Hematomas can usually be distinguished from neoplasia on MR by the signal patterns of hemoglobin breakdown products, which are dependent on the chemical bonding and oxidation state of hemoglobin iron. Beginning with a discussion of relevant atomic electronic structure, this review will examine how oxyhemoglobin, deoxyhemoglobin, methemoglobin, and hemosiderin, the principal iron compounds occurring in the various stages of a hematoma, affect its appearance on MRI.
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  • 30
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 10-14 
    ISSN: 1432-2161
    Schlagwort(e): Key words Wrist ; MR arthrography ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Purpose.In the wrist, to determine whether passive motion or active exercise yields a better indirect MR arthrographic effect following intravenous gadolinium administration. Design and patients. Twenty-six consecutive patients were studied by indirect wrist MR arthrography. In half active exercise and in half passive motion was performed. Four regions of interest were studied including the distal radioulnar joint, the radiocarpal joint, the midcarpal joint, and the triangular fibrocartilage. Ranges and means of signal intensity were calculated. Surgical follow-up was performed in 22 patients. Results. The joint fluid intensity was greatest in the distal radioulnar joint. Fluid signal intensity was greater and more consistent in the passive motion group although the results did not achieve statistical significance. Imaging accuracy appeared similar in the two groups and was excellent for the triangular fibrocartilage (100%) and scapholunate ligaments (96%). Conclusion. Active exercise and passive motion yield similar degrees of wrist arthrographic effect, but the effect of passive motion is somewhat more consistent. Preliminary data show good accuracy for internal derangements.
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  • 31
    ISSN: 1432-2161
    Schlagwort(e): Key words Gaucher disease ; Bone disease ; Extraosseous Gaucher disease ; Bone marrow imaging ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Objective. To investigate the frequency and morphology of extraosseous extension in patients with Gaucher disease type I. Design and patients. MRI examinations of the lower extremities were analyzed in 70 patients with Gaucher disease type I. Additionally, the thoracic spine and the midface were investigated on MRI in two patients. Results. Four cases are presented in which patients with Gaucher disease type I and severe skeletal involvement developed destruction or protrusion of the cortex with extraosseous extension into soft tissues. In one patient, Gaucher cell deposits destroyed the cortex of the mandible and extended into the masseter muscle. In the second patient, multiple paravertebral masses with localized destruction of the cortex were apparent in the thoracic spine. In the third and fourth patient, cortical destruction with extraosseous tissue extending into soft tissues was seen in the lower limbs. Conclusions. Extraosseous extension is a rare manifestation of Gaucher bone disease. While an increased risk of cancer, especially hematopoietic in origin, is known in patients with Gaucher disease, these extraosseous benign manifestations that may mimic malignant processes should be considered in the differential diagnosis of extraosseous extension into soft tissues. A narrow neck of tissue was apparent in all cases connecting bone and extraosseous extensions.
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  • 32
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 40-44 
    ISSN: 1432-2161
    Schlagwort(e): Key words Subchondral insufficiency fracture ; Femoral head ; Medial femoral condyle ; Osteonecrosis ; MRI ; X-ray
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  This case report documents the clinical, radiographic, and histologic findings in a 69-year-old obese man, who had subchondral insufficiency fracture both in the femoral head and medial femoral condyle. On plain radiographs, both lesions underwent subchondral collapse. Magnetic resonance images of the left hip showed a bone marrow edema pattern with associated low-intensity band on T1-weighted images, which was convex to the articular surface. The histopathologic findings in the hip and knee were characterized by the presence of a subchondral fracture with associated callus and granulation tissue along both sides of a fracture line. There was no evidence of antecedent osteonecrosis. To our knowledge, this is the first case report to describe the multiple occurrence of collapsed subchondral insufficiency fracture.
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  • 33
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 45-48 
    ISSN: 1432-2161
    Schlagwort(e): Key words Cystic fibrous dysplasia ; Giant cell tumor ; Femur ; X-ray ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We report the case of a 43-year-old man who presented with an osteolytic and expansive lesion in the left distal femur mimicking a giant cell tumor. Magnetic resonance imaging (MRI) showed that most of the lesion was cystic, and histological examination revealed fibrous dysplasia with marked cystic degeneration. Radiographic findings of cystic fibrous dysplasia in the end of a long bone may be similar to those of a giant cell tumor, and a biopsy is essential for the final diagnosis.
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  • 34
    ISSN: 1432-2161
    Schlagwort(e): Key words Hemangiopericytoma ; Tibia ; MRI ; Angiography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  The Magnetic Resonance Imaging (MRI) appearances of primary osseous hemangiopericytoma (HPC) have been rarely described. We report on a 46-year-old Chinese man with primary osseous HPC of the right tibia. The characteristic vascular distribution of this tumor, presenting with a ”spoke-wheel” appearance on MR images and with angiographic correlation, is described. Although not pathognomonic, this MR appearance may be an important finding in suggesting the diagnosis of osseous HPC.
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  • 35
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 555-562 
    ISSN: 1432-2161
    Schlagwort(e): Keywords Diffusion ; MRI ; Skeletal system ; Spine ; neoplasms
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  This article reviews the principles of diffusion-weighted imaging (DWI) and recent results in DWI of the musculoskeletal system. The potential of DWI in the diagnosis of pathology of the musculoskeletal system is discussed. DWI is a relatively new MR imaging technique that has already been established in neuroradiology, especially in the early detection of brain ischemia. The random motion of water protons on a molecular basis can be measured with DWI. To date DWI of the abdomen and of the musculoskeletal system has only been employed in scientific studies, but first results indicate that it may also be beneficial in these fields. Different diffusion characteristics have been found in normal tissues such as muscle, fat and bone marrow. Also, pathologic entities such as neoplasms, post-therapeutic soft tissue changes and inflammatory processes can be differentiated. Normal muscle shows significantly higher diffusion values than subcutaneous fat and bone marrow, due to a higher mobility of water protons within muscle. Soft tissue tumors exhibit a significantly lower diffusion value compared with post-therapeutic soft tissue changes and inflammatory processes. Necrotic tumor tissue can be distinguished from viable tumor due to significantly higher diffusion of water protons within necrotic tissue.
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  • 36
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 597-600 
    ISSN: 1432-2161
    Schlagwort(e): Keywords Parosteal osteosarcoma ; Telangiectatic osteosarcoma ; Dedifferentiation ; Femur ; Radiography ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  A unique case of parosteal osteosarcoma (POS) of the proximal femur, with areas of telangiectatic dedifferentiation, in a 28-year-old woman is reported. The patient had a 7-week history of pain and swelling in her right thigh. A biopsy diagnosis of POS was established. The patient was treated with two cycles of intra-arterial chemotherapy, followed by limb salvage surgery. Histological examination of the resected specimen showed POS with areas of dedifferentiation composed of high-grade telangiectatic osteosarcoma with associated secondary aneurysmal bone cyst change.
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  • 37
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 646-651 
    ISSN: 1432-2161
    Schlagwort(e): Keywords Ewing sarcoma ; Primitive neuroectodermal tumour ; Radiography ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Objective.To describe the clinical, radiological and MRI features of six atypical cases of histologically proven appendicular Ewing sarcoma/ primitive neuroectodermal tumour (PNET). Design. Retrospective review of case notes and available imaging was carried out. Patients. Six patients (4 male, 2 female; mean age 27years, range 19–44 years), presenting over a 77-month period, were identified from the Bone Tumour Register. All had unusual clinical and imaging features for Ewing sarcoma/PNET. Results and conclusions. Four tumours were centred on the distal femoral metaphysis, one in the proximal tibial metaphysis and one in the distal tibial metaphysis. Plain radiographs were available in four cases and showed minor cortical changes. MRI demonstrated a relatively small, eccentrically located intraosseous component with a large, eccentric extraosseous component. Extension into the epiphysis was seen in three cases and into the adjacent joint in two cases. Intraosseous ”skip” metastases were present in three cases. The clinical and imaging features were atypical for conventional intraosseous Ewing sarcoma/PNET and the exact site of origin (intraosseous, periosteal or soft-tissue) was unclear.
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  • 38
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 656-659 
    ISSN: 1432-2161
    Schlagwort(e): Keywords Osteoblastoma-like osteosarcoma ; Osteosarcoma ; Aggressive osteoblastoma ; Fibula ; Radiography ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We report an osteoblastoma-like osteosarcoma in the right proximal fibula in a 22-year-old woman. Radiographs showed an irregular osteolytic lesion from the metaphysis to the epiphysis in the proximal fibula with partial destruction of cortical bone. Tissue from a biopsy indicated a typical osteoblastoma. Curettage and bone graft was performed. One year after the surgery, local recurrence occurred, and a wide excision was performed. Histological examination of the en-bloc surgical specimen revealed the tumor had permeated through the host bony trabeculae, although the nuclear atypia was not marked. Immunohistochemical expression of MIB-1 was detected in 9.0% of cells.
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  • 39
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 660-663 
    ISSN: 1432-2161
    Schlagwort(e): Keywords Acute lymphoblastic leukemia ; Chemotherapy ; Spine ; Tunneling Schmorl’s nodes ; CT ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We present a 70-year-old woman with pre-B acute lymphoblastic leukemia in whom serial imaging studies showed the development of multiple vertebral collapse, and communicating superior and inferior Schmorl’s nodes creating a longitudinal channel (”tunneling” Schmorl’s nodes) through the anterior aspect of T12 to L3 vertebral bodies of her osteoporotic thoracolumbar spine. This was observed after achieving complete remission of the disease and during maintenance therapy. The finding is felt to be secondary to iatrogenic exacerbation of osteoporosis.
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  • 40
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 664-667 
    ISSN: 1432-2161
    Schlagwort(e): Keywords Giant cell tumor ; Multiple mid-foot bones ; Reconstructive surgery ; Radiography ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We report on a patient who had giant cell tumor involving multiple bones of the mid-foot. The tumor originated from the navicular bone, but also destroyed the cuboid, and all cuneiform bones. This unusual presentation of giant cell tumor presented a therapeutic challenge for the surgeons. The patient was treated with en bloc resection and the bony defect replaced with a massive iliac crest graft which united within 9 months and has remained stable for 7 years without local recurrence, and with excellent function of the foot.
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  • 41
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 717-720 
    ISSN: 1432-2161
    Schlagwort(e): Keywords Amyloidoma ; Bilateral ; Knee ; Popliteal fossa ; Claudication ; MRI ; MR angiography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  The authors report a case of bilateral popliteal amyloidoma causing stenosis of the popliteal artery and vein. This patient had been treated with hemodialysis for 26 years. The diagnosis was made with MR angiography. A popliteal tumor of the right knee was resected surgically and the histologic examination showed deposition of amyloid. After resecting the popliteal tumor, the severe leg pain and intermittent claudication improved. This report suggests that popliteal amyloid tumors should be considered in a patient undergoing long-term hemodialysis who complains of leg pain and intermittent claudication.
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  • 42
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 721-725 
    ISSN: 1432-2161
    Schlagwort(e): Key words Chordoma ; Sarcomatoid chordoma ; Transitional feature ; Sacrum ; CT ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We report a case of chordoma containing a spindle cell sarcomatoid component with a gradual transition from conventional chordoma. Immunohistochemically, many tumor cells in both conventional chordoma and sarcomatoid components were positive for cytokeratins (AE1/AE3, CAM5.2) and epithelial membrane antigen as well as vimentin. This report provides a rare example of sarcomatoid chordoma. Familiarity with this type of bone tumor should help to avoid confusion with dedifferentiated chordoma and other spindle cell sarcomas or carcinomas.
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  • 43
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 97-100 
    ISSN: 1432-2161
    Schlagwort(e): Key words Transient osteoporosis ; Transient bone marrow edema ; Intra-articular regional migratory osteoporosis ; Knee ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We report a case of lntra-articular regional migratory osteoporosis of the knee in a 53-year-old man. The case demonstrates an unusual pattern of migration of the marrow edema within the knee joint. This phenomenon has received scant attention in the radiological literature.
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  • 44
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 171-175 
    ISSN: 1432-2161
    Schlagwort(e): Key words Desmoplastic fibroma ; Bone tumor ; Femur ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Desmoplastic fibroma of bone is a very rare benign tumor, which may be locally aggressive. In contrast to the well-documented radiological appearance, the literature on MR imaging features of this tumor is scarce. The MR imaging characteristics in our case are compared to those previously reported. Although there is a considerable overlap in the MR imaging features with other bone tumors, an interesting MR feature of desmoplastic fibroma is the presence of low to intermediate signal intensity foci on T2-weighted images, which radiographically does not correspond to calcifications. This feature may help narrow the differential diagnosis.
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  • 45
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 168-170 
    ISSN: 1432-2161
    Schlagwort(e): Key words Chondromyxoid fibroma ; Acromium ; Soft tissue extension ; CT ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Chondromyxoid fibroma is an unusual, benign tumor of cartilaginous origin and represents less than 1% of all primary bone tumors. It usually involves the long bones around the knee joint or the flat bones of the pelvis or ribs. Soft tissue extension is also thought to be rare in these lesions. They are usually eccentrically located in the metaphyses of the long bones and centrally in the flat bones. The radiographic appearances are characteristically those of a single, lytic lesion with lobulated margins, septations, cortical expansion and a sclerotic rim. Histologically, they display a lobulated pattern with spindle-shaped cells lying within a myxoid matrix with areas of hyaline cartilage. The differential diagnosis includes giant cell tumor, chondroblastoma or enchondroma as well as chondrosarcoma. The rarity of these lesions may render the diagnosis difficult to make, especially when the lesion involves an unusual site such as the acromium.
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  • 46
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 224-226 
    ISSN: 1432-2161
    Schlagwort(e): Key words Intraosseous neurilemmoma (schwannoma) ; Primary bone neoplasm ; Metacarpal ; X-ray ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Intraosseous schwannoma (neurilemmoma) is an extremely rare, benign neoplasm, constituting less than 0.2% of primary bone tumors. It infrequently involves the bones of the hand. We present a case of intraosseous neurilemmoma of the metacarpal.
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  • 47
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 231-234 
    ISSN: 1432-2161
    Schlagwort(e): Key words Hemangioma ; Ulna ; CT ; MRI ; X-ray
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  An 18-year-old woman presented with left elbow joint pain. Radiographs and computed tomographic scan showed a well-defined osteolytic lesion of the left ulna associated with a honeycomb appearance on the radiographs. Magnetic resonance images showed intermediate signal intensity on T1-weighted images and mixed intermediate and high signal intensities on T2-weighted images. Only the periphery of the lesion enhanced with intravenously injected gadolinium-diethylenetriamine pentaacetic acid. The lesion was curetted to avoid pathologic fracture, and a histologic diagnosis of cavernous hemangioma of bone was made. Hemangioma involving the ulna is rare, but should be included in the differential diagnosis of a radiographic osteolytic lesion with a honeycomb appearance.
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  • 48
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 293-297 
    ISSN: 1432-2161
    Schlagwort(e): Key words Angiomyolipoma (AML) ; Soft tissue ; Thigh ; MRI ; CT ; Angiography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  A 41-year-old man presented with an asymptomatic mass in the right medial thigh. Magnetic resonance imaging (MRI) revealed a well-demarcated, 10-cm mass in the right adductor muscles. The margins of the mass exhibited high signal intensity and the rest showed low or iso signal intensity on T1-weighted MR images. However, the high signal intensity was decreased on T2-weighted images with fat suppression. The central part of the tumor was of inhomogeneous high signal intensity on T2-weighted images; after Gd-DTPA injection it enhanced inhomogeneously on T1-weighted images with fat suppression. On dynamic computed tomography (CT) in the arterial phase, there were strongly enhancing spotty areas in the tumor. At surgery, a yellow-whitish tumor was resected and a pathological diagnosis of angiomyolipoma (AML) in the thigh was made.
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  • 49
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 346-348 
    ISSN: 1432-2161
    Schlagwort(e): Key words Amyloid tumor ; Tibia ; Periosteum ; Bilateral ; MRI ; Bilateral metachronous periosteal tibial amyloid tumors
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Localized primary periosteal amyloid tumors are extremely rare. A case of bilateral tibial amyloid tumor is presented. A 62-year-old woman initially presented with a painful mass in the anterior aspect of the right leg. There was no evidence of underlying systemic disease, including chronic infection or malignancy. Based on the results of resistance with Congo red staining to treatment with potassium permanganate and positivity for kappa light chain, we classified this particular case as AL-type amyloidosis. The patient noticed a swelling in the opposite leg 2 years later. The second tumor was also an AL-type amyloidoma. Amyloid tumors are generally solitary. This is the first case of bilateral periosteal amyloid tumors of the AL-type occurring in the tibiae.
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  • 50
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 387-391 
    ISSN: 1432-2161
    Schlagwort(e): Key words Trauma ; Hand ; Sonography ; Ultrasound ; Annular pulleys ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Objective. To evaluate the sonographic (US) appearance of digital annular pulley (DAP) tears in high-level rock climbers. Design and patients. We performed a retrospective analysis of the US examinations of 16 high-level rock climbers with clinical signs of DAP lesions. MRI and surgical evaluation were performed in five and three patients respectively. The normal US and MRI appearances of DAP were evaluated in 40 and three normal fingers respectively. Results. Nine of 16 patients presented a DAP tear. In eight subjects (seven with complete tears involving the fourth finger and one the fifth finger), US diagnosis was based on the indirect sign of volar bowstringing of the flexor tendons. Injured pulleys were not appreciated by US. Tears concerned the A2 and A3 in six patients and the A3 and A4 in two patients. A2 pulley thickening and hypoechogenicity compatible with a partial tear was demonstrated in one patient. MRI and surgical data correlated well with the US findings. Four patients had tenosynovitis of the flexor tendons but no evidence of pulley disruption. US examinations of three patients were normal. In the healthy subjects US demonstrated DAP in 16 of 40 digits. Conclusion. US can diagnose DAP tears and correlates with the MRI and surgical data. Because of its low cost and non-invasiveness we suggest US as the first imaging modality in the evaluation of injuries of the digital pulley.
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  • 51
    ISSN: 1432-2161
    Schlagwort(e): Key words Bones ; infection ; Bones ; radionuclide studies ; MRI ; comparative studies ; Bones ; MRI studies ; MRI ; extremities ; Bones ; immunoscintigraphy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Objective. A retrospective study of the validity of combined bone scintigraphy (BS) and immunoscintigraphy (IS) using 99mTc-labelled murine antigranulocyte antibodies (MAB) and magnetic resonance imaging (MRI) in chronic post- traumatic osteomyelitis. Design and patients. The results of MRI and combined BS/IS of 19 lesions in 18 patients (13 men, 5 women; mean age 45 years, range 27–65 years) were independently evaluated by two radiologists and one nuclear medicine physician with regard to bone infection activity and extent. The patient group was a highly selective collection of clinical cases: the average number of operations conducted because of relapsing infection was eight (range 2–27), the average time interval between the last surgical intervention and the present study was 6.5 years (range 3 months to 39 years), and from the first operation was 14 years (range 1.5–42 years). Interobserver agreement on MRI was measured by kappa statistics. Sensitivity, specificity, accuracy, positive predictive value (PPV) and negative predictive value (NPV) were calculated for MRI and the nuclear medicine studies. Results. For MRI/nuclear medicine, a sensitivity of 100%/77%, a specificity of 60%/50%, an accuracy of 79%/61%, a PPV of 69%/58% and a NPV of 100%/71% were calculated. Four MR examinations were false positives because of postsurgical granulation tissue. A high degree of interobserver agreement was found on MRI (κ=0.88). A low-grade infection was missed on two scintigrams, while four were false positive because of ectopic haematopoietic bone marrow, and in one examination the anatomical distortion resulted in an inaccurate assignment of the uptake leading to false positive findings. Image analysis was frequently hindered by susceptibility artefacts due to residual abrasions of metallic implants after removal of orthopaedic devices (15/18 patients); this led to limited assessment in 17% (3/18 patients). Conclusion. Acute activity in a chronic osteomyelitis can be excluded with high probability if the MRI findings are negative. In the first postoperative year fibrovascular scar cannot be distinguished accurately from reactivated infection on MRI and scintigraphy may improve the accuracy of diagnosis. MRI is more sensitive in low-grade infection during the later course than combined BS/IS. Scintigraphic errors due to ectopic, peripheral, haematopoietic bone marrow can be corrected by MRI.
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  • 52
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 447-453 
    ISSN: 1432-2161
    Schlagwort(e): Key words Tuberculosis ; Sternum ; Clavicle ; CT ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Objective. To describe the imaging findings in sterno-clavicular tubercular involvement. Design and patients. Fifteen patients with pathologically proven tuberculosis of the sternum and clavicle were retrospectively evaluated. Routine radiography, computed tomography (CT) and magnetic resonance imaging (MRI) were used in some or all of the patients. Clinical information and imaging features were evaluated in each case. Results. Eight patients had sterno-clavicular joint (SCJ) involvement, five had isolated sternal involvement and two had isolated clavicular involvement. Seven patients were evaluated with only CT, six with only MRI and two with both. There were eight male and seven female patients, varying in age between 16 and 78 years. Fever, swelling and pain were common presenting symptoms. Two patients were HIV positive. Radiographs were positive in only eight patients. Destruction and signal intensity (SI) changes of the sternum and clavicle, destruction of the cartilage, soft tissue changes representing granulation tissue/abscess, displacement of the adjacent structures (vessels, trachea, etc.) and inflammatory changes in the adjacent structures in the form of cellulitis and myositis were common imaging features. Conclusions. All imaging methods can provide complementary information regarding sterno-clavicular tubercular involvement that is helpful for determination of the therapy. MRI is useful in determining the extent of the lesion, particularly marrow involvement and soft tissue extent.
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  • 53
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 477-480 
    ISSN: 1432-2161
    Schlagwort(e): Key words Diabetes mellitus ; Muscle, infarction ; Short T1 ; Hemorrhage ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We describe a case of diabetic muscle infarction which had atypical features of hyperintensity of the affected muscle on T1-weighted images. Biopsy was performed which revealed diffuse extensive hemorrhage within the infarcted muscle. We believe increased signal intensity on T1-weighted images should suggest hemorrhage within the infarcted muscle.
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  • 54
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 481-484 
    ISSN: 1432-2161
    Schlagwort(e): Key words Meniscal ossicles ; Ultrasound ; CT-arthrography ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  A case of meniscal ossicles occurring in the left knee of a 23-year-old woman is presented. Radiographs showed two calcified lesions at the posteromedial aspect of the knee which were interpreted as loose bodies. Sonography, computed tomography arthrography and magnetic resonance imaging showed the fragments within the posterior horn of the medial meniscus permitting a diagnosis of meniscal ossicles. These techniques can detect meniscal ossicles and exclude intra-articular loose bodies.
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  • 55
    ISSN: 1432-2161
    Schlagwort(e): Key words Giant rice body ; Ultrastructure ; Immunohistochemistry ; Histogenesis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Objective: To report four cases of rice bodies (RBs) showing remarkable size variations and discuss their pathogenesis. Design and patients: Based on analysis of the clinical data, we speculate on the pathogenesis of RBs using immunohistochemical and ultrastructural methods. The patients comprised three men and one woman, three with RBs in the subacromial bursae and one in the wrist synovial sheath, aged 28 (woman), 44, 50 and 81 (wrist) years, respectively. Results: There were no particular differences in clinical data among the patients. T2-weighted MR imaging was very useful for diagnosis of the RBs, allowing their clear delineation from the bursal fluid. The RBs consisted of a layered protein- aceous substance with vague targetoid cut surfaces. Much fibrin and a lesser amount of collagen fibers were recognized together with various mononuclear cells, which were few in number and predominantly T cells. The bursae and synovial sheath had multiple fibrinoid spheroids at the luminal surface. Conclusion: Fibrinoid nodular deposits probably became detached, forming the nuclei of RBs and growing to a giant RB 65 mm in diameter.
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  • 56
    ISSN: 1432-2161
    Schlagwort(e): Key words Metastatic bone tumor ; Knee ; Spontaneous osteonecrosis ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We report a case of a metastatic bone tumor that mimicked spontaneous osteonecrosis of the medial condyle of the femur on magnetic resonance imaging.
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  • 57
    ISSN: 1432-2161
    Schlagwort(e): Key words Chronic leg ulcers ; Squamous cell carcinoma ; Malignancy ; Snake bite ; X-rays ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Chronic ulcers of the leg are common in Brazil, perhaps more common than in the developed world. We report a case of a chronic ulcer of the leg following extensive scarring due to a bite by a venomous snake, which eventually led to a squamous cell carcinoma.
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  • 58
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 354-357 
    ISSN: 1432-2161
    Schlagwort(e): Key words Intraosseous meningioma ; Microcystic meningioma ; Parietal bone ; X ray ; CT ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Extradural ectopic meningioma is a rare tumor. We report on an example of microcystic meningioma arising in the skull of an elderly woman. Radiological examination revealed a localized osteolytic lesion in the left parietal bone. At surgery, it was discovered that the tumor was located within the skull without any evidence of extraosseous extension. The light microscopic, immunohistochemical and ultrastructural features were consistent with a microcystic variant of meningioma. To our knowledge, this is the first case of an intraosseous microcystic meningioma, and we believe that this type of meningioma should be considered in the differential diagnoses of myxoid bone tumors of the calvarium.
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  • 59
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 417-420 
    ISSN: 1432-2161
    Schlagwort(e): Key words Arm ; Collagenous fibroma ; Desmoplastic fibroblastoma ; Short T2 ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  A recently proposed addition to fibrous tumors in soft tissue was first described as desmoplastic fibroblastoma and later renamed collagenous fibroma. This tumor is clinically and morphologically distinct and benign. However, only a few series have been reported, and the clinicopathologic features are not widely recognized. We present two cases of collagenous fibroma of the arm. Both patients presented with an enlarging, well-circumscribed and mobile soft tissue mass. Magnetic resonance imaging showed areas of low signal intensity on both T1- and T2-weighted sequences. Needle aspiration cytology revealed nondiagnostic samples because of the low cellularity of the tumors. Each of the resected tumors was composed of low-cellular spindle- to stellate-shaped cells in a fibrous matrix with clear margination. After the marginal excisions, no recurrences were observed. Clinicians should be aware of this entity to prevent overtreatment, because imaging findings and cytologic features are similar to those of desmoid tumor.
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  • 60
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 29 (2000), S. 425-438 
    ISSN: 1432-2161
    Schlagwort(e): Key words Muscles ; MRI ; Myositis ; Muscles ; Abscess ; Dermatomyositis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Inflammatory myopathies encompass a group of acquired muscle disorders caused by infectious agents (bacteria, viruses, fungi and parasitic agents) or autoimmune processes (polymyositis, dermatomyositis and other types). In suspected infection sonography, CT and MRI are all able to show edema and fluid collections in soft tissues and muscles; sonography and CT may help guidance of a needle aspiration to establish a correct diagnosis. By offering better tissue differentiation, MRI appears to be more efficient than sonography and CT in diagnosing and managing autoimmune myopathies. MRI is indeed very sensitive to the presence of water and edema, and appears to be a very good indicator for an early diagnosis of diseases. MRI may also help to evaluate the extent and number of lesions, to guide a biopsy in an area of active disease and finally to follow the evolution under therapy.
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  • 61
    ISSN: 1432-2161
    Schlagwort(e): Key words Chondrolipoma ; Liposarcoma ; Mesenchymoma ; Cartilage ; Metaplasia ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Chondro-osseous differentiation of three benign or malignant fat tissue tumors – two chondrolipomas and a liposarcoma with cartilaginous metaplasia – was studied with magnetic resonance (MR) imaging and compared with their pathological findings. The results suggest that demarcation of cartilage tisssue can be clearly defined on MR imaging when the size of the cartilaginous area is large. Myxoid matrix, degenerative fat tissue and lipodystrophic change may decrease the delineation of the cartilage tissue.
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  • 62
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 35-42 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Neugeborenes ; Frühgeborenes ; Ultraschall ; Gehirn ; Rückenmark ; Key words ; Premature infant ; Newborn ; Sonography ; Brain ; Spinal cord
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Examination of the central nervous system in premature and full-term infants requires a sensible selection of the available diagnostic procedures such as ultrasound, MRI and CT to allow sufficient and accurate diagnosis and management. Ultrasound: Ultrasound, including the various Doppler techniques, is a very reliable, safe, noninvasive diagnostic tool that allows evaluation of even severely ill patients in intensive care units. It is especially well suited for the study of intracranial hemorrhage, hypoxic-ischemic encephalopathy, congenital malformations of the brain and lesions produced by intrauterine and acquired infections. Sonography is also very reliable in examination of spinal dysraphism and spinal cord injuries during birth. The necessity of surgical intervention (i.e. shunt implantation) as well as subsequent postoperative follow-up can be provided. MRI: In contrast to ultrasound, MRI is most useful to demonstrate the age-dependent myelinization pattern and clearly discriminates between the white and gray matter of the central nervous system. We therefore use MRI for the detection of complex malformations of the central nervous system in particular disorders of cell migration and for a final estimation of a perinatal brain injury. Conclusion: A precise ultrasound examination performed by an experienced physician who is familiar with the expected pathology and has access to a well-adjusted ultrasound machine should help to minimize the use of confirming CT and MRI investigations and to optimize their optional use in more complex cases.
    Notizen: Zusammenfassung Zur Untersuchung des Gehirns und Rückenmarks von Früh- und Neugeborenen müssen die zur Verfügung stehenden Bildmodalitäten – Ultraschall, MR, CT – gemäß ihrer Aussagekraft in Bezug auf klinische Fragestellung und therapeutische Konsequenz angewendet werden. Ultraschall: Der Ultraschall einschließlich der verschiedenen Dopplertechniken ermöglicht ohne Sedierung die rasche, risikoarme und sehr zuverlässige Untersuchung auch schwerkranker Kinder auf der Intensivstation. Es gilt, die Hirnblutungen, die hypoxisch-ischämischen Hirnschädigungen und ihre Folgen, Hirnmissbildungen, Folgen kongenitaler und postnatal erworbener Infektionen, die Dysrhaphien des Rückenmarks und die geburtstraumatischen Rückenmarkschädigungen nachzuweisen oder auszuschließen, die Indikation zu chirurgischen Interventionen (z.B. Drainage eines Hydrozephalus) zu stellen und deren Erfolg zu beurteilen. Für den frühen Nachweis hypoxisch-ischämischer Schädigungen ist der Ultraschall wenig sensitiv. MRT: Da das MR im Gegensatz zum Ultraschall die altersabhängige Myelinisierung zeigt und die Unterscheidung zwischen grauer und weißer Substanz ermöglicht, nützen wir diese anatomische Auflösung bei der Untersuchung von sowohl sehr komplexen Hirnfehlbildungen als auch solchen, die mit Migrationsstörungen einhergehen, und gelegentlich für die abschließende Beurteilung des Ausmaßes einer perinatalen Hirnschädigung. Schlussfolgerung: Nach einer sorgfältig durchgeführten Ultraschalluntersuchung durch einen mit der zu erwartenden Pathologie vertrauten Untersucher mit einem hochauflösenden Ultraschallgerät sollten CT- und MR-Untersuchungen nur zur Bestätigung des Ultraschallbefunds überflüssig sein, zu deren evtl. notwendiger Ergänzung jedoch optimiert erfolgen.
    Materialart: Digitale Medien
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  • 63
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 72-77 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Kongenitale Anomalien der Nieren ; Neonatale Hydronephrosen ; Ultraschall in der Neonatalperiode ; Key words ; Congenital anomalies of the kidneys ; Neonatal hydronephrosis ; Neonatal ultrasound
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Malformations of the urinary tract are one of the most common types of anomalies in the neonatal period. Approximately 15–20% of all prenatally detected malformations require acute postnatal imaging. Sonography is the primary imaging modality in the evaluation of nephro-urologic problems in infancy. Hydronephrosis represents the most common pathology, followed by multicystic-dysplastic kidney. Discussion: The result of the sonographic examination directs further imaging. An adequate diagnostic algorithm is decisive for accurate diagnosis, for the appropriate therapeutic regimen and for the prognosis of the patients.
    Notizen: Zusammenfassung Fehlbildungen der Nieren und der ableitenden Harnwege zählen zu den häufigsten kongenitalen Anomalien in der Neugeborenenperiode. Etwa 15–20% aller pränatal diagnostizierten Fehlbildungen erfordern eine akute postnatale Diagnostik. Die Sonographie ist das initiale bildgebende Verfahren der Wahl in der Abklärung nephrourologischer Fragestellungen im Kindesalter. Hydronephrosen stellen die häufigsten Pathologien dar, die multizystisch-dysplastische Niere steht an 2. Stelle. Diskussion: Das Ergebnis der Sonographie ist richtungsweisend für die Wahl der weiteren bildgebenden Verfahren. Der adäquate diagnostische Algorithmus ist entscheidend für die richtige Diagnose, das geeignete therapeutische Prozedere und letztendlich für die Prognose der Patienten.
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  • 64
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter Gelenkknorpel ; MRT ; Arthrose ; Keywords Hyaline cartilage ; MRI ; Osteoarthritis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Abstract MRI is the most accurate noninvasive technique available for assessment of normal articular cartilage and cartilage lesions. MRI cannot only provide morphologic information about the area of damage, but can also provide unique insight into the biochemical composition of the articular cartilage. New image processing techniques such as three-dimensional mapping of cartilage thickness will help to establish automated analysis of cartilage loss. Theses techniques are ideally suited for monitoring patients who undergo treatment with new chondroregenerative drugs.
    Notizen: Zusammenfassung Die MRT ist die beste verfügbare Untersuchungsmethode zur Darstellung des normalen und geschädigten Gelenkknorpels. Sie gibt nicht nur Aufschluss über die Morphologie des geschädigten Areals, sondern auch über die biochemische Zusammensetzung des Gelenkknorpels. Neue Bildverarbeitungstechniken wie die dreidimensionale Erfassung/Darstellung der Knorpeldicke werden bei der Entwicklung einer automatisierten Analyse des Knorpelverlustes helfen. Diese Techniken sind auch ideal zur Verlaufsbeobachtung von Patienten, die sich einer Behandlung mit knorpelregenerierenden Substanzen unterziehen.
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  • 65
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 469-472 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter Nutritialgefäßkanäle ; Os lunatum ; Lunatummalazie ; Ganglion ; Ulnaimpaktionssyndrom ; Key words Nutrient vessel canals ; Lunate bone ; MRI ; Kienböcks disease ; Ulna impaction syndrome ; Carpal ganglia
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Purpose: To find and describe potential MRI criteria of nutrient vessel canals of carpal bones. Methods and Material: 16 wrists of 13 patients with pain and radiographic depiction of cystic changes within the lunate were examined. The MRI protocol included coronal and sagittal T1- and T2-weighted SE sequences (4 mm slices, 120 FOV, 256×256 matrix) as well as coronal STIR images. Final diagnosis was confirmed by surgery (n=5) and follow up. 10 cadaveric ossa lunata were studied to describe size, number, location and shape of nutrient vessel canals. Results: Ganglion cysts (n=6) showed characteristic signs. In ulnar impaction syndrome (n=1) small cystic lesions in the lunate were surrounded by a sclerotic rim and located near the proximal ulnar surface. In Kienböck’s disease (n=3) cystic components were irregular and surrounded by bone marrow edema. Nutrient vessel canals (n=7) imaged as 1 to 3 small cystic lesions within the palmar or dorsal subchondral region. Conclusion: MRI can aid in differential diagnosis of cystic carpal lesions. Nutrient vessel canals may not be mistaken for pathologic cystic lesions. Carpal ganglion cysts show distinct diagnostic pattern.
    Notizen: Zusammenfassung Fragestellung: Sind karpale Nutritialgefäßkanäle auf MRI Bildern sichtbar und welche differentialdiagnostischen Kriterien lassen sich finden. Material und Methode: In 16 Fällen lagen bei 13 Patienten röntgenologisch wenige mm bis 2 cm große zystische Läsionen im Os lunatum vor. Das MRT-Protokoll umfaßte koronare und sagittale T1- und T2-gewichtete SE-Sequenzen mit 4 mm Schichtdicke, 120 mm Meßfeld und 2562 Matrix sowie koronare STIR-Sequenzen. Die Diagnosesicherung erfolgte durch Operation in 5 Fällen sowie Verlaufskontrollen. 10 mazerierte Ossa lunata wurden auf Form, Lokalisation, Anzahl und Größe der Nutritialgefäßkanäle untersucht. Ergebnisse: Ganglien (n=6) wiesen typische Zeichen auf. Im Falle eines Ulnaimpaktionssyndroms bei Ulna-Nullvariante wurden mehrere kleine zystische Läsionen im Os lunatum gefunden, umgeben von einem Sklerosesaum. Bei 3 Fällen einer frühen Lunatummalazie waren unregelmäßige zystische Komponenten von einem diffusen Ödem umgeben. In 7 Fällen mit sehr kleinen zystischen Defekten waren diese subchondral, palmar und dorsal gelegen und entsprachen aufgrund des klinischen Verlaufs und der Lokalisation Nutritialgefäßkanälen. Schlußfolgerung: Nutritialgefäßkanäle dürfen nicht mit pathologischen zystischen Prozessen des Os lunatums verwechselt werden. Mittels MRT können zystische Läsionen im und am Os lunatum weiter spezifiziert werden. Handgelenksganglien weisen typische MR-Zeichen auf.
    Materialart: Digitale Medien
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  • 66
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 557-560 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter Plasmazell-Osteomyelitis ; Magnetresonanztomografie ; Wirbelsäule ; Key words Plasmacellular osteomyelitis ; MRI ; Spine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Abstract The authors report the case of a young patient suffering from plasmacellular osteomyelitis of the thoracic spine, a unusual localisation of this type of chronic osteomyelitis. They discuss the role of imaging diagnostic modalities in this disease, focussing on MRI.
    Notizen: Zusammenfassung Wir berichten über den Fall einer jungen Patientin mit Plasmazell-Osteomyelitis an der Brustwirbelsäule als ungewöhnliche Lokalisation dieser chronischen Osteomyelitis-Form. Dabei wird die Rolle der bildgebenden Diagnostik, insbesondere der Magnetresonanztomografie diskutiert.
    Materialart: Digitale Medien
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  • 67
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 1017-1029 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter Hirnabszess ; Zerebritis ; Metastatische Herdenzephalitis ; Endokarditis ; MRT ; Gd-DTPA ; Keywords Brain abscess ; Cerebritis ; Metastatic focal encephalitis ; Endocarditis ; MRI ; Gd-DTPA
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Abstract The hematogenous spread of bacteria, fungi and protozoa may also reach the brain vessels, which happens mostly through septic emboli. From such an embolus a metastatic focal encephalitis and later a septic-embolic brain abscess may arise. The most frequently underlying infections that may cause septic emboli are bacterial endocarditis as well as bacterial infections of artificial heart valve prostheses. Congenital heart malformations with a right-to-left shunt also play here a certain role. Basically, however, all septic conditions and bacteriemias may cause septic-embolic brain abscesses. They occur frequently as multiple lesions. MRI is superior to CT in depicting the different stages of evolution from focal encephalitis, through the hardly encapsulated early abscess, to the formation of a membrane and later a dense fibrous capsule. The medical treatment of a brain abscess requires properly performed CT or MRI follow-up examinations in order to realize early enough a possible growing of such a lesion.
    Notizen: Zusammenfassung Die hämatogene Ausbreitung von Bakterien, Pilzen oder Protozoen bis in die Hirngefäße erfolgt meist durch eine septische Embolie. Es entstehen eine metastatische Herdenzephalitis und im weiteren Verlauf daraus ein septisch-embolischer Hirnabszess. Die häufigste Grunderkrankung die zu septischen Embolien führt ist die bakterielle Endokarditis sowie die bakterielle Infektion von Herzklappenprothesen. Eine besondere Bedeutung kommt hier den angeborenen kardialen Fehlbildungen mit Rechts-Links-Shunt zu. Grundsätzlich können jedoch alle Bakteriämien zu septisch-embolischen Hirnabszessen führen. Septisch-embolische Hirnabszesse treten aufgrund ihres Entstehungsmechanismus häufig multipel auf. Die CT und besser noch die MRT erlauben die Darstellung aller Entwicklungsstadien von der Herdenzephalitis über den kaum abgegrenzten Abszess, die Membranbildung bis zur Entstehung einer dicken, die eitergefüllte Höhle allseits umgebenden Abszesskapsel. Die medikamentöse Therapie von Hirnabszessen erfordert Verlaufsuntersuchungen, um einer eventuellen Größenzunahme der Läsion(en) frühzeitig durch Umstellung der antibiotischen Medikation oder durch operative Abszessentfernung zu begegnen.
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  • 68
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 123-129 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Spiral-CT ; Herz ; Retrospektives Gating ; Zeitauflösung ; Key words ; Spiral CT ; Heart imaging ; Retrospective gating ; Temporal resolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Purpose: Spiral CT of the heart using the established ways of ECG synchronization is hampered by the relatively long acquisition times of 250 to 500 ms. This only allows to acquire diastolic images in patients with moderate heart rates. In this work, algorithms for time-optimized retrospective cardiac gating are presented, and their potential to improve temporal resolution is investigated. Material and methods: These algorithms use data from multiple gantry rotations for image reconstruction, which is possible for multi-scans at fixed slice positions as well as for overlapping spiral scans. Temporal resolution was quantified using computer simulations and compared to experimental data from pigs. Results: Using a conventional sub-second CT scanner, considerably higher temporal resolutions are possible with spiral scanning. A temporal resolution of 170 ms already provides systolic images with little motion artifacts. Higher temporal resolutions of up to 70 ms are demonstrated for multi-scans, which allows to depict ventricle wall movement over the complete cardiac cycle. Discussion: The method of time-optimized retrospective cardiac gating broadens the spectrum of conventional spiral-CT for cardiac imaging. It can be directly transferred to multi-slice scanners. Here it can be used clinically because of reduced scan time. Potential applications are the determination of functional cardiac parameters like ejection fraction and the detection of disorders of ventricle wall movement.
    Notizen: Zusammenfassung Zielsetzung: Die Spiral-CT des Herzens ist mit bisherigen Verfahren zur EKG-Synchronisation nur eingeschränkt möglich. Die Aufnahmezeit von ca. 250 bis 500 ms ermöglicht nur diastolische Aufnahmen bei Patienten mit moderater Herzfrequenz. In dieser Arbeit wurden Algorithmen zum zeitoptimierten retrospektiven EKG-Gating entwickelt und untersucht, wie höhere Zeitauflösungen erreicht werden können. Material und Methode: Das Prinzip der Algorithmen ist es, Daten von mehreren Gantry-Umläufen für die Bildrekonstruktion heranzuziehen. Dies ist sowohl in einzelnen Schichten als auch bei Spiralscans mit überlappenden Aufnahmeschichten möglich. Die Zeitauflösung wurde durch Computersimulationen für verschiedene Aufnahmeparameter bestimmt und mit Experimenten an Schweinen verglichen. Ergebnisse: Es zeigt sich, dass mit einem Standard-Subsekunden-CT-Scanner mit überlappenden Spiralen deutlich höhere Zeitauflösungen möglich sind, bereits 170 ms ermöglichen eine Darstellung der Systole mit nur minimalen Bewegungsartefakten. An einzelnen Schichten wurden Zeitauflösungen von bis zu 70 ms demonstriert, womit die Herzwandbewegung über den kompletten Herzzyklus dargestellt werden kann. Diskussion: Die Methode des zeitoptimierten retrospektiven EKG-Gating erweitert die Einsatzmöglichkeiten herkömmlicher Spiral-CTs für die Bildgebung des Herzens. Sie lässt sich direkt auf Multizeilen-CTs übertragen, wo sie wegen der Reduktion der Untersuchungszeit klinisch eingesetzt werden kann. Mögliche Anwendungen sind die Bestimmung von funktionellen Herzparametern wie Ejektionsfraktion und die Detektion von Wandbewegungsstörungen.
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  • 69
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Magnetresonanztomographie ; Flussmessung ; Koronararterie ; Koronare Bypassgefäße ; Key words ; MR imaging ; Flow quantification ; Coronary artery ; Coronary bypass grafts
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Purpose: To evaluate accuracy of velocity encoded cine MR imaging for determination of blood flow in coronary arteries and coronary bypass grafts. Materials and methods: 12 patients with 22 coronary bypass grafts underwent intraoperative flow quantification using the transit time ultrasound method. These values were compared to postoperative MR phase shift measurements. Flow measurements were performed preoperatively in 28 coronary arteries of 20 patients. For flow measurement, we used a velocity-encoded k-space segmented gradient echo sequence with a temporal resolution of 110 or 125 ms, respectively. 6–8 pase shift images could be acquired during one cardiac cycle. Results: There was a significant correlation between intraoperative and flow measurements using velocity-encoded MR imaging (r=0.74, p〈0.0001, t-test). Flow volumes determined by MR imaging were systemati-cally larger than those determined by the transit time ultrasound method. Mean flow in coronary arteries was reduced in severly stenosed vessels (〉70%) compared to normal vessels. Intra- and interobserver vari-ability were 10.5 and 15% (coronary bypass grafts), and 12.3 and 15.8% (coronary ar- teries), respectively. Conclusions: Velocity-encoded MR imaging enables determination of flow in coronary artery bypass grafts and coronary arteries. Future developments should aim at the improvement of spatial and temporal resolution of the method.
    Notizen: Zusammenfassung Ziel: Es sollte die Genauigkeit der MR-Phasenkontrastmethode zur Ermittlung des Flusses in Koronararterien und koronaren Bypassgefäßen bestimmt werden. Material und Methode: Die MRT-Flussmessungen von 12 Patienten mit 22 Bypassgefäßen wurden mit intraoperativ mittels Ultraschalldurchflussmethode bestimmten Flüssen verglichen. Präoperativ wurden zusätzlich Flussmessungen in 28 Koronararterien von 20 Patienten durchgeführt. Zur MRT-Flussmessung wurde eine segmentierte 2D-Flash-Sequenz verwendet, die eine zeitliche Auflösung von 110 bzw. 125 ms aufwies. Dies ermöglichte die Akquisition von 6–8 Bildpaaren pro Herzzyklus. Ergebnisse: Es bestand eine signifikante Korrelation zwischen den Ergebnissen der intraoperativen und denen der postoperativen MRT-Flussmessung (r=0,76, p〈0,0001, t-Test). Das mit der MRT gemessene Flussvolumen lag über dem bei der Ultraschallmessung ermittelten. Die Bestimmung des mittleren Flusses in den Koronararterien zeigte deutliche Unterschiede zwischen Gefäßen mit höhergradiger Stenose (〉70%) und Gefäßen ohne Stenose. Die Intra- und Interbeobachtervariabilitäten betrugen 10,5 und 15% (Bypass) bzw. 12,3 und 15,8% (Koronararterien). Schlussfolgerungen: Die Phasenkontrastmethode ermöglicht – in Kenntnis ihrer Limitationen – eine relativ genaue Bestimmung des Blutflusses in Koronararterien und koronaren Bypassgefäßen. Weiterentwicklungen der Methode müssen eine verbesserte räumliche und zeitliche Auflösung zum Ziel haben.
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  • 70
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 177-183 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Mammakarzinom ; Früherkennung ; Qualitätssicherung ; Key words ; Breast cancer ; Screening ; Quality assessment
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary In Germany there is still an urgent need for action in regard to screening for breast cancer. The announcement of research projects for mammography screening proves this. The following reports the results of the Munich field study. In 2 years, 2489 breast cancer cases were registered (status 6/98). Screening data were available for 1319 patients. The reduction in mortality, found in randomized studies, due to mammography in women over 50 years old was confirmed. A relative reduction of 44.8% in 10-year mortality could be estimated through mammography and 25.1% through palpation, in comparison with ”doing nothing”. We could also estimate the participation of screening and the used methods in the Munich region. If the mammographies carried out today were used at 2-year intervals for women aged between 50 and 70 years, then the mammography screening could be performed with no additional costs for 70% of the women. The known facts regarding the population-based mortality and regarding the acceptance of the palpation screening and frequency of mammography are additional aspects for inclusion in the discussion of what research projects in Germany are and what they should fulfill.
    Notizen: Zusammenfassung Hintergrund: Bei der Früherkennung des Mammakarzinoms besteht in Deutschland nach wie vor ein dringender Handlungsbedarf. Die Ausschreibung von Modellprojekten zur Einführung des Mammographiescreenings belegt dies. Im folgenden wird – als Diskussionsgrundlage –über erste Ergebnisse der Feldstudie München berichtet. Ergebnisse: In einem Zeitraum von 2 Jahren wurden 2489 Mammakarzinome registriert (Stand Juni 1998). Zu 1319 Patientinnen sind Angaben zur Früherkennung verfügbar. Die durch randomisierte Studien gesicherte Senkung der Mortalität durch die Mammographie im Alter 〉50 Jahre konnte bestätigt werden. Aufgrund der dokumentierten Stadienverteilung beträgt die Schätzung für die relative Senkung der 10-Jahres-Mortalität durch die Mammographie 44,8% und durch die Palpation 25,1% im Vergleich zum „Nichtstun”. Auch die Inanspruchnahme der Früherkennung und die in der Region München eingesetzten Methoden konnten abgeschätzt werden. Schlussfolgerungen: Würden die heute durchgeführten Mammographien bei Frauen im Alter zwischen 50 und 70 Jahren mit einem Abstand von 2 Jahren eingesetzt, so könnte das Mammographiescreening bei etwa 82% der Frauen kostenneutral durchgeführt werden. Die bekannten Fakten zur Mortalität und zur bundesweiten Inanspruchnahme des heutigen Früherkennungsangebots sind weitere Grundlagen für die Diskussion, was Modellprojekte in Deutschland sein und was sie wann leisten sollten.
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  • 71
    Digitale Medien
    Digitale Medien
    Springer
    Der Schmerz 14 (2000), S. 1-4 
    ISSN: 1432-2129
    Schlagwort(e): Schlüsselwörter ; Kopfschmerz ; Kinder ; Akuttherapie ; Flupirtin ; Paracetamol ; Keywords ; Children ; Acute treatment ; Tension-type headache ; Flupirtine ; Paracetamol
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Abstract Background: About 10% of all schoolchil- dren are suffering from migraine and 50% from tension-type headache. Headache of acute onset usually will be treated with analgesic substances like paracetamol, acetylsalicylic acid or ibuprofen, the first one being the reference drug for tension-type headache in childhood. In case of lacking improvement or side-effects there is demand for an alternative safe substance for the acute analgesic therapy. Methods: In a double-blind randomised investigation flupirtine and paracetamol were given in two consecutive attacks of episodic tension-type headache. 30 children, 6–12 years old, were included. Dosage was determined according to age and weight. The children documented the acute headache intensity and duration in a special diary. Results: Headache intensity was reduced during 2 h after intake in 89% of the 19 children treated. The reduction was 6,5 to 3,1 for flupirtine and 6,9 to 3,3/10 for paracetamol. There was no statistically significant difference between the two substances. Relevant side-effects could not be observed. Conclusion: Flupirtine has shown a convincing clinical effect treating acute episodic tension-type headache for children. The substance was well tolerated by the patients. In addition, flupirtine provides a high degree of safety.
    Notizen: Zusammenfassung Hintergrund: Etwa 10% aller Schulkinder leiden nach neueren deutschen epidemiologischen Untersuchungen zumindest gelegentlich an Migräne und etwa 50% an Kopfschmerzen vom Spannungstyp. Häufig nehmen sie bei Spannungskopfschmerzen analgetische Monosubstanzen wie Paracetamol, Azetylsalizylsäure oder Ibuprofen ein. Bei nicht ausreichender Wirkung bzw. Unverträglichkeit besteht Bedarf nach weiteren Substanzen für die Akutanwendung. Methode: In einer doppelblindrandomisierten und gekreuzten Anordnung wurden Paracetamol bzw. das analgetisch und muskelrelaxierend wirksame Flupirtin 30 6- bis 12jährigen Kindern für 2 episodische Spannungskopfschmerzattacken angeboten. 10 Kinder benötigten nach dem Erstkontakt keine Medikation mehr, 1 Kind lehnte die Einnahme grundsätzlich ab. Ergebnisse: Die Kopfschmerzstärke verringerte sich laut Kopfschmerztagebuch innerhalb von 2 h nach der Einnahme auf einer numerischen Schmerzskala (0–10) von 6,5 auf 3,1 unter Flupirtin und von 6,9 auf 3,3 unter Paracetamol bei 89% der verbliebenen 19 Kinder. Statistisch signifikante Unterschiede zwischen beiden Substanzen bestanden nicht. Als Nebenwirkung trat 1-mal Erbrechen unter Paracetamol auf. Schlussfolgerung: Flupirtin hat sich in der Akutphase von episodischen Spannungskopfschmerzen beim Kind bewährt. Es verfügt über eine gute Verträglichkeit. Im Vergleich zu Paracetamol scheint v.a. bei akzidenteller Überdosierung eine größere Sicherheit zu bestehen.
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  • 72
    Digitale Medien
    Digitale Medien
    Springer
    Der Schmerz 14 (2000), S. 5-9 
    ISSN: 1432-2129
    Schlagwort(e): Schlüsselwörter ; Periphere Nervenläsionen ; Begutachtung ; Neuropathie ; Minderung der Erwerbs- fähigkeit ; Keywords ; Peripheral nerve lesion ; Neuralgia-physiopathology ; Causalgia-physiopathology ; Loss of earning capacity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Abstract Introduction: The loss of functional capacity by peripheral nerve lesion is easy to be estimated: A certain neurologic dysfunction results in a characteristic reduction of the former individual capacity. In contrast, the effect of accompanying pain to every-day life and working ability is not known exactly. In this study, we compared the results of judgement in nerve lesions under the circumstances of additional pain syndromes. Methods: From January 1994 until Dezember 1998 we saw 57 patients with peripheral nerve lesions, part of them with an additional pain syndrome. Beside conventional neurological examination a detailed pain analysis has been done. Results: Lesions of the median or ulnar nerves showed regularly disturbences in neurological functions (10/14 for the mediane nerve, 13/16 for the ulnar nerve). Astonishing is the fact, that serious pain after nerve lesion only occurs in cases of partial nerve lesion. We saw neuralgias in 6 patients with ulnar neuropathy, in three cases of median nerve lesions we could see severe neuralgia (causalgia we found in 3 cases of ulnar neuropathy, in 6 cases after Median Nerve lesion). Patients with a lesion of the central plexus brachialis showed in 10 of 11 cases an additional pain syndrome. Other nerves have been affected more rarely. For the judgement of the loss of earning capacity we saw an additional pain related diminuition of at least 10% compared to those patients without pain problems. Conclusions: The common grading scales for peripheral nerve lesions are not suitable in cases accompanied by an additional pain syndrome. Beside a functional deficit the effect of severe pain in these patients has to be estimated. On an average, patients with addtitional pain-problems get a 10% extended loss of earning capacity, even more in particular cases.
    Notizen: Zusammenfassung Fragestellung: Anhand retrospektiver Daten sollten geeignete Bewertungsgrundlagen für die Begutachtung peripherer Nervenläsionen erarbeitet werden. Methode: Von Januar 1994 bis Dezember 1998 wurden insgesamt 57 Patienten (36 männlich, 21 weiblich, Durchschnittsalter 33,9 Jahre) mit dieser Fragestellung im Rahmen einer Begutachtung untersucht. Ursächlich lagen traumatische Ereignisse bei 39 (68%), postoperative Störungen bei 14 und andere Schädigungen bei 4 Patienten zugrunde. Ergebnisse: Beim N. medianus und N. ulnaris (beispielhaft) überwogen die Schmerzzustände bei inkompletten Läsionen. Neuralgien fanden sich bei 3 bzw. 6 Patienten mit N.-medianus- bzw. N.-ulnaris-Läsion. Eine Kausalgie fand sich bei 6 bzw. 3 Patienten. Mit Ausnahme von Armplexusläsionen waren andere Nerven seltener betroffen. Diese Situation wurde mit einer durchschnittlich um 10% höher gelegenen Einschätzung der Leistungseinbuße berücksichtigt, wenn gleichzeitig Schmerzen vorlagen. Schlussfolgerungen: Die für die reine Funktionseinbuße gültigen Skalen zur Bemessung peripherer Nervenläsionen können für die Begutachtung von Schmerzsyndromen nur bedingt herangezogen werden. Meist führen Schmerzen zu einer um durchschnittlich 10% höheren Einschränkung der Erwerbsfähigkeit (MdE), allerdings sind in manchen Fällen auch größere Einbußen denkbar.
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  • 73
    Digitale Medien
    Digitale Medien
    Springer
    Der Schmerz 14 (2000), S. 10-17 
    ISSN: 1432-2129
    Schlagwort(e): Schlüsselwörter ; Schmerzerkrankungen ; Krankheitsschwere ; Chronifizierungsstadien ; Mainzer Stadienmodell ; Keywords ; Chronic pain ; Grading procedure ; Mainz Pain Staging System
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Abstract Introduction: Chronic pain is an individually variable experience, incorporating physical, psychological and social dimensions. Chronic pain occurs in a broad spectrum of severity; therefore, a grading procedure is of crucial importance in clinical research and in epidemiologic studies. The Mainz Pain Staging System is an interview-administered, multi-dimensional measure of chronic pain severity. The system suggests grading chronic pain in terms of 4 axes: time (persistence), spreading of pain site, medication use, and health care utilization. The whole scale consist of 10 items. The resulting score is used to classify the pain problem in three stages (I, II, III). Analysing the broader validity and parametric properties of the staging system is the purpose of the present study. Methods: The staging system and psychosocial data were administered to 542 consecutive patients of different diagnoses who attended one of six pain clinics in the year 1995/96. In a time period of 3 months since first contact, treatment procedures were registered. Three months after first contact patients rated the effectiveness of treatment concerning reduction of pain intensity. Results: According to the criteria of the staging system 25% of the sample belonged to each stage I and stage III, whereas 50% were classified to stage II. As a measure of validity, chronic pain status demonstrated significant correlation with psychological impairment, disability and time off work, whereas there was no correlation to pain intensity and persistence of pain. Surprisingly we found no difference in amount and quality of treatment between patients who were graded as severe pain patients (stage III) and the other stages. Furthermore, effectiveness of treatment also did not differ between the three stages. We made several proposals for optimizing the staging system. Conclusion: Given the high prevalence of recurrent and chronic pain as well as the broadness of severity, an important issue on further research is identification of factors which influence the chronification process. For this purpose improved measures of graded classification of pain status are needed.
    Notizen: Zusammenfassung Hintergrund: Die Beschreibung von Schmerzsyndromen ist durch eine Diagnose allein nicht ausreichend gewährleistet; erst die Angabe der Krankheitsschwere ermöglicht sowohl die Indikation der entsprechenden Behandlung als auch eine Vergleichbarkeit von Fällen. Patienten und Methode: In einer multizentrischen Studie wurde bei 542 Patienten das aus der Mainzer Arbeitsgruppe um Gerbershagen 1986 vorgestellte Stadienmodell der Chronifizierung ermittelt und in Abhängigkeit von Patienten- und Diagnosemerkmalen sowie im Hinblick auf seine parametrischen Eigenschaften analysiert. Ergebnisse und Diskussionen: Die Ergebnisse der Untersuchung bestätigen die gute Validität des Verfahrens im Hinblick auf seine Unabhängigkeit von schmerzspezifischen Parametern. Es besteht theoriegemäß eine gute Übereinstimmung zum Ausmaß der emotionalen Befindlichkeit (Depression), zur subjektiven Beeinträchtigung und zum Ausmaß der Arbeitsunfähigkeit. Die Ergebnisse zeigen auch Ansätze für Verbesserungsmöglichkeiten. Einige der berücksichtigten Kriterien sind vermutlich überflüssig, während der zusätzliche Einbezug des subjektiven Beeinträchtigungserlebens notwendig erscheint. Ob ein übergreifendes Graduierungsmodell für verschiedene Schmerzerkrankungen überhaupt valide sein kann, muss eine weitergehende Analyse zeigen.
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  • 74
    Digitale Medien
    Digitale Medien
    Springer
    Der Schmerz 14 (2000), S. 29-32 
    ISSN: 1432-2129
    Schlagwort(e): Schlüsselwörter ; Flupirtin ; Langzeitbehandlung ; Keywords ; Flupirtine ; Long-term treatment
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Abstract Case report: The worker O.H., born in 1959, had in 1992 an accident as a car driver. His injuries were a severe acceleration trauma of the cervical spine with rupture of the longitudinal ligament, a concussion of the brain, and an eye injury. Therapy: After the emergency treatment, the multidisciplinary management could not resolve the persistent musculoskeletal cervicocephal and -brachial pain syndrome. The long-term application of 100 mg flupirtine tid improved the chronic pain state for 50–60%. Due to this regimen, the patient could be rehabilitated.
    Notizen: Zusammenfassung Fallbericht: Der 1959 geborene Arbeiter (O.H.) erlitt im September 1992 als PKW-Fahrer einen Wegeunfall mit schwerem HWS-Trauma, Commotio cerebri, Oberlidverletzung und Augapfelprellung rechts. Danach persistierten zervikozephale und zervikobrachiale Schmerzen. Behandlung: Nach der Evaluation verschiedener Therapieverfahren erfolgte die Einstellung auf durchschnittlich 3-mal 100 mg Flupirtin täglich mit dem Ergebnis einer durchschnittlich 50- bis 60%igen Linderung starker, belastungsabhängiger Dauerschmerzen. Dank dieser Medikation konnte der Betroffene beruflich integriert werden.
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  • 75
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 18-27 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; MRT ; Neugeborene ; Cerebrum ; Fetus ; Key words ; MRI ; Neonatal ; Brain ; Fetal
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Magnetic resonance tomography (MRT) has become the most important method in the workup of infantile cerebral complications after primary sonography. Cerebral MR examination and image interpretation during the infantile period require extensive knowledge of morphological manifestations, their pathophysiological background, and frequency. The choice of imaging parameters and image interpretation is demonstrated in infarctions and hemorrhages of the mature and immature brain. A review of the main differential diagnoses is also given. The relevance of MR spectroscopy and fetal MRI is discussed.
    Notizen: Zusammenfassung Zur Abklärung zerebraler Veränderungen bei Neugeborenen hat sich die Magnetresonanztomographie (MRT) als wichtigste weiterführende Methode nach der Sonographie entwickelt. Die Durchführung und Auswertung der MR-Untersuchungen erfordern jedoch eine genaue Kenntnis der morphologischen Manifestationen, des pathophysiologischen Hintergrunds und der Häufigkeit bestimmter zerebraler Komplikationen in diesem Lebensalter. Resümee: Ausgehend von zerebrovaskulären Erkrankungen werden diese Fragen behandelt, wobei sowohl auf die Auswahl der adäquaten Untersuchungsparameter als auch auf die Bildinterpretation und die wichtigsten Differentialdiagnosen eingegangen wird. Die Bedeutung von MR-Spektroskopie und fetaler MRT wird diskutiert.
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  • 76
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 43-51 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Thorax ; Neugeborene ; Frühgeborene ; Kongenitale Pathologien ; Erworbene Pathologien ; Key words ; Chest ; Newborn ; Preterm infant ; Congenital pathologies ; Acquired pathologies
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary In diagnostic imaging of thoracic pathologies in mature and especially immature neonates, chest X-ray has a leading position. Profound knowledge of the normal chest X-ray and the potential physiological perinatal changes is the basic requirement for interpretation of the X-ray of a neonate. Childhood pathologie: Many congenital and acquired diseases that the radiologist is faced with in neonatology are unknown in the imaging of adults. Many of these changes are life-threatening or may have an impact on the patient’s future quality of life. Therefore early diagnosis in close cooperation with the paediatrician is essential. We give here an overview of the most important pathologic changes that the radiologist may be con- fronted with in daily routine.
    Notizen: Zusammenfassung In der bildgebenden Diagnostik thorakaler Pathologien bei reifen und insbesondere unreifen Neugeborenen steht das Thoraxröntgenbild an erster Stelle. Profunde Kenntnisse des normalen Thoraxbilds und der möglichen physiologischen peripartalen Veränderungen sind Voraussetzung für die Interpretation der neonatologischen Thoraxaufnahme. Kindliche Pathologien: Eine Vielzahl von kongenitalen und erworbenen Veränderungen, mit denen der Radiologe in der Neonatologie konfrontiert ist, sind in der Radiodiagnostik des erwachsenen Patienten unbekannt. Viele dieser Veränderungen sind für den Patienten lebensbedrohlich oder können die Lebensqualität in seinem weiteren Leben beeinflussen. Eine frühzeitige Diagnostik in enger Zusammenarbeit mit dem Pädiater ist daher essenziell. Hier wird ein Überblick über die wichtigsten Pathologien, mit denen der Radiologe in der täglichen Routine konfrontiert sein kann, gegeben.
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  • 77
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 63-71 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Gastrointestinaler Notfall ; Neugeborenenalter ; Bildgebende Diagnostik ; Key words ; Gastrointestinal emergency ; Nenoate ; Diagnostic imaging
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Gastrointestinal emergencies in neonates often demand a quick and efficient diagnos-tic imaging. The procedures have to take the special diseases and conditions in these babies and preterm children into account. Conclusion: This paper summarises the most common causes for gastrointestinal neonatal emergencies and discusses the indication and performance as well as the diagnostic value of the commonly used modalities, giving some suggestions for an efficient imaging algorithm. Most of the time conventional plain abdominal films and sonography can answer the clinically important questions, however, in certain conditions fluoroscopy with contrast administration (enema, etc.) is mandatory. Only rarely is CT, MRI or Angiography indicated.
    Notizen: Zusammenfassung Der gastrointestinale Notfall im Neugeborenenalter erfordert oft eine rasche, effiziente, den Bedingungen des Neu- und Frühgeborenenalters angepasste bildgebende Diagnostik. Diese Arbeit beschreibt die in diesem Zusammenhang wichtigsten angeborenen und erworbenen Erkrankungen und diskutiert die Durchführung und Indikation bzw. den Stellenwert der zur Verfügung stehenden bildgebenden Methoden. Schlussfolgerung: Zumeist kann mit dem Abdomenübersichtsröntgen und dem Sonogramm eine ausreichende diagnostische Klärung erzielt werden. Bei bestimmten Fragestellungen ist jedoch eine weitergehende Beurteilung durch ein Kontrastmittelröntgen bzw. eine Durchleuchtungsuntersuchung (wie z.B. Schluckakt- und Magenröntgen oder Irrigoskopie) unabdingbar. CT, MRT oder Angiographie werden nur seltenst benötigt.
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  • 78
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 78-82 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Intranet ; Internet ; PACS ; Radiologie ; Key words ; Intranet ; Internet ; PACS ; Radiology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary The aim of the paper is to present the conceptual basis and capabilities of intranet applications in radiology. The intranet, which is the local brother of the internet can be readily realized using existing computer components and a network. All current computer operating systems support intranet applications which allow hard and software independent communication of text, images, video and sound with the use of browser software without dedicated programs on the individual personal computers. Radiological applications for text communication e.g. department specific bulletin boards and access to examination protocols; use of image communication for viewing and limited processing and documentation of radiological images can be achieved on decentralized PCs as well as speech communication for dictation, distribution of dictation and speech recognition. Discussion: The intranet helps to optimize the organizational efficiency and cost effectiveness in the daily work of radiological departments in outpatients and hospital settings. The general interest in internet and intranet technology will guarantee its continuous development.
    Notizen: Zusammenfassung Ziel dieses Beitrags ist es, konzeptionelle Grundlagen und Möglichkeiten von Intranetanwendungen in der Radiologie aufzuzeigen. Das Intranet, das der lokale Bruder des Internets ist, kann gegenwärtig relativ einfach mit den bestehenden Computerkomponenten und einem Netzwerk realisiert werden. Alle aktuellen Betriebssysteme unterstützen Intranetanwendungen, mit denen sowohl Hardware – als auch Software – unabhängig mit Hilfe von sog. Browsern die Kommunikation von Text, Bild, Video und Ton möglich ist, ohne dass auf den peripheren Rechnern entsprechend spezielle Software vorhanden sein muss. Beispielhafte Anwendungen der Textkommunikation werden vorgestellt, wie z.B. abteilungsspezifische Informationen und Untersuchungsprotokolle, außerdem Anwendungen der Bild- und Tonkommunikation. Diskussion: Das Intranet eröffnet insbesondere im täglichen Einsatz radiologischer Abteilungen im ambulanten und stationärem Bereich neue Möglichkeiten zur organisatorischen Effizienzsteigerung und Kosteneffektivität. Das globale Interesse an der Inter- und Intranettechnologie sichert die kontinuierliche Weiterentwicklung.
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  • 79
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter Mammatumor ; MRT ; Markierung ; Biopsie ; Keywords Breast lesion ; MRI ; Localization ; Biopsy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Abstract Purpose. MRI-guided interventional maneuvers in the breast, when closed MRI scanners are employed are relatively complex and time consuming. The purpose of our investigations was to develop a special device for the localization and biopsy of breast lesions using an open low-field MRI Scanner (Magnetom Open, Siemens, Erlangen, Germany) permitting free access to the patient. Materials and Methods. Due to its particular material and construction characteristics, a newly developed device for localization and biopsy of breast lesions is appropriate to remain within the magnetic field during the examination without degrading image quality. We performed 125 tests in a phantom and 31 investigations in patients including 26 wire-localizations and 5 biopsies. Results. The interventional maneuvers in the phantom could be performed very precisely. In all 125 phantom studies, the needle (14G coaxial biopsy cannula, Bard) was positioned close to the simulated lesion. In 25 out of 26 patients the needle was positioned within a distance less than 5 mm from the lesion. When using the 14G coaxial biopsy cannula (Bard, Karlsruhe, Germany) the needle tip was found adjacent next to the lesion in all 12 cases (7 wire-localizations, 5 biopsies). Conclusions. Our results indicate that our device allows very precise preoperative localization of breast lesions within the Magnetom Open. Using MRI-compatible, large-core needles, biopsy under direct MRI control resulted in good results.
    Notizen: Zusammenfassung Zielsetzung. Am geschlossenen MRT-Gerät sind Interventionen an der Mamma relativ aufwendig und zeitintensiv. Ziel unserer Untersuchungen war es, eine Lokalisations- und Biopsieeinrichtung für das offene MRT-Gerät (Magnetom Open, Siemens) zu entwickeln und zu erproben, das Patienten und Methode. Es wurde eine Lokalisations- und Biopsieeinrichtung entwickelt, die aufgrund ihrer Bauart während der Intervention im Magnetfeld des MRT-Gerätes verbleiben kann und die Bildgebung nicht nachteilig beeinflusst. Um die Tauglichkeit dieses Gerätes zu überprüfen wurden 125 Untersuchungen am Phantom und 31 Patientenuntersuchungen (26 Drahtlokalisationen, 5 Biopsien) durchgeführt. Ergebnisse. Die Interventionen am Phantom konnten sehr genau gesteuert werden. In allen 125 Fällen lag die Interventionsnadel (14 G-Coaxial-Biopsiekanüle, Bard) direkt der Läsion an. Bei den Patientenuntersuchungen lag die Interventionsnadel in 25 von 26 Fällen weniger als 5 mm von der Läsion entfernt. Bei Verwendung der 14 G-Coaxial-Biopsie-Kannüle (Bard, Karlsruhe, Germany) lag die Interventionsnadel in allen 12 Fällen direkt der Läsion an (7 Drahtlokalisationen, 5 Hochgeschwindigkeitsbiopsien). Schlussfolgerung. Die Untersuchungen zeigen, dass mit der von uns entwickelten Zieleinrichtung sehr genaue präoperative Lokalisationen am Magnetom Open durchführbar sind. Durch die stabile Nadelführung sind bei Verwendung lumenstarker Materialien (14G) zudem exakte MRT-kontrollierte Biopsien möglich.
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  • 80
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Mehrzeilen-CT ; Elektronenstrahl-CT ; Koronar-Screening ; CT Angiographie ; Koronarsklerose ; Keywords ; Multidetector CT ; Electron beam CT ; Coronary screening ; CT angiography ; Coronary atherosclerosis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Purpose: Multirow-detector-spiral-CT (MSCT) allows for 250 ms effective exposure time. The purpose of this study was to demonstrate the possibilities and limitations of this CT technology for non enhanced and contrast enhanced investigation of the coronary arteries. Methods: Investigation of the coronary arteries without contrast medium for quantification of coronary calcifications was performed in an obese patient (140 kg) with MSCT and electron beam CT (EBCT). In 56 patients contrast enhanced CT angiography of the coronary arteries was performed to determine image quality depending on the heart rate. Results: In the obese patient superior image quality could be achieved with MSCT allowing for reliable quantification of coronary calcifications. With MSCT angiography of the coronary arteries good image quality was achieved in patients with a heart rate of 59±8 beats per minute. Conclusion: Even if there are limitations in patients with higher heart rates with an effective exposure time of 250 ms MSCT has clear advantage of image quality in the assessment of non enhanced and contrast enhanced coronary arteries.
    Notizen: Zusammenfassung Fragestellung: Mit dem Mehrzeilendetektorspiral-CT (MSCT) sind effektive Aufnahmezeiten von 250 ms möglich. Die Möglichkeiten und Grenzen dieser CT-Technologie zur nativen und kontrastverstärkten Untersuchung der Koronargefäße sollen in dieser Arbeit dargestellt werden. Methode: Die native Untersuchung der Koronargefäße zur Quantifizierung von Koronarkalk wurde bei einem Patienten mit Adipositas (140 kg) mit dem Elektronenstrahl-CT (EBCT) und dem MSCT vorgenommen. Bei 56 Patienten wurde eine kontrastverstärkte MSCT-Angiographie der Koronargefäße vorgenommen und festgestellt, bei welcher Herzfrequenz eine diagnostisch ausreichende Bildqualität zu erreichen ist. Ergebnisse: Bei der Untersuchung des Patienten mit Adipositas konnte mit dem MSCT eine erheblich bessere Bildqualität erreicht werden, die eine Quantifizierung von Koronarkalk erheblich erleichterte. Mit der MSCT-Angiographie der Koronargefäße konnte bei einer Herzfrequenz von 59±8 Schlägen/min eine diagnostisch gute Bildqualität erreicht werden. Schlussfolgerung: Auch wenn mit einer effektiven Aufnahmezeit von 250 ms Limitationen bei höheren Herzfrequenzen zu erwarten sind, können mit dem MSCT entscheidende Vorteile in der Bildqualität in der nativen und kontrastverstärkten Untersuchung der Koronargefäße erreicht werden.
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  • 81
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Herz ; Herz-MR ; Volumen ; Cine MR ; Key words ; Heart ; Cardiac MRI ; Volume ; Cine MR
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Purpose: To evaluate method- and user effects as well as the required time in the determination of left- and right ventricular ejection fractions in comparing manual and semiautomatic border detection of the endocardium. Methods: In 22 patients with varying cardiac diseases endocardial borders were detected either manually or semiautomatically (seeded ROI) and subsequently the right and left ventricular volume ejection fractions were computer-calculated. Two investigators defined the endocardial borders for both ventricles using both methods. For statistical analysis two-factorial analyses of variance were performed for the four variables: VEF right ventricle, VEF left ventricle, required time right ventricle, required time left ventricle (SAS, Anova). Results: There was no user or method effect detectable for both ventricles. The required time for both ventricles also did not reveal a user effect, but there was a dramatic method effect concerning a reduction of the required time for analysis for both ventricles 〉50%. Conclusions: The semiautomatic mode for detecting the endocardial borders in determining right and left ventricular ejection fractions did not demonstrate results differing from the results of the manual method, but is significantly superior concerning the time required for analysing ejection fractions of both ventricles with a reduction of over 50%. This might significantly reduce the expenditure for personnel.
    Notizen: Zusammenfassung Fragestellung: Die manuelle und semiautomatische Endokarddetektion zur Bestimmung links- und rechtsventrikulärer Volumenejektionsfraktionen (VEF) werden verglichen. Ziel dieser Arbeit ist die Evaluierung des Methoden- und Anwendereffekts sowie der Bearbeitungszeit beider Verfahren. Methode: An 22 Patienten mit unterschiedlichen kardialen Erkrankungen wurden die Endokardgrenzen manuell und mit einem semiautomatischen Verfahren (Seeded-ROI) ermittelt und anschließend die rechts- und linksventrikulären Volumenejektionsfraktionen automatisch berechnet. In allen Fällen wurden von 2 Untersuchern die Endokardgrenzen des rechten und linken Ventrikels manuell und semiautomatisch bestimmt. Zur statistischen Analyse wurden 2-faktorielle Varianzanalysen (Methoden- und Anwendereffekt einschließlich Wechselwirkungen) für die 4 Variablen durchgeführt: VEF rechtsventrikulär, VEF linksventrikulär, Zeitaufwand rechtsventrikulär, Zeitaufwand linksventrikulär (SAS, Anova). Ergebnisse: Bezüglich der Bestimmungen der rechts- und linksventrikulären VEF war weder ein Methoden- (p=0,9613) noch ein Anwendereffekt (p=0,3095) nachweisbar. Bezogen auf die benötigte Bearbeitungszeit fand sich ebenfalls kein Anwendereffekt, aber ein massiver Methodeneffekt (p〈0,0001) im Sinn einer Reduzierung der Bearbeitungszeit um 〉50% sowohl für den rechten als auch für den linken Ventrikel. Schlussfolgerung: Nach unseren Erfahrungen liefert das semiautomatische Seeding-Verfahren zur Festlegung der Endokardgrenzen bei der Bestimmung der links- und rechtsventrikulären Ejektionsfraktionen keine von der manuellen Methode abweichenden Ergebnisse, ist aber bezüglich der Bearbeitungszeit deutlich überlegen. Die über 50%ige Zeitersparnis reduziert den Personalaufwand.
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  • 82
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Koronare Herzkrankheit ; Magnetresonanztomographie ; Myokardperfusion ; SPECT ; Key words ; Coronary artery disease ; Magnetic resonance imaging ; Myocardial perfusion ; SPECT
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Aim: Performance of combined rest/stress MR perfusion studies and the analysis of qualitative signal intensity parameters in comparison with 99mTc-SestaMIBI SPECT in patients with known coronary artery disease (CAD). Methods: Sixteen patients with CAD underwent MR myocardial perfusion assessment at rest and after dipyridamole-induced hyperemia. Qualitative parameters (SI increase, SI upslope) of the SI time-curves were evaluated and characteristics of normal, reversible and persistent hypoperfused myocardium as assessed by 99mTc-SestaMIBI SPECT were compared. Results: Compared with the rest values, normal myocardium showed a significant increase of the SI upslope during hyperemia (P〈0.001), whereas persistent (P=0.07) and reversible (P=0.15) hypoperfusions showed only minor changes. SI increase over baseline also showed a significant increase only in normal myocardium (P〈0.001). At rest, reversible ischemic areas showed no significant differences from normal myocardium, whereas during hyperemia SI increase was significantly lower (P=0.02). Conclusions: Qualitative SI parameters of a combined rest/stress MR myocardial perfusion study allow to differentiate normal from reversibly or persistently hypoperfused myocardium.
    Notizen: Zusammenfassung Fragestellung: Die kombinierte Ruhe- und Belastungsuntersuchung der myokardialen Durchblutung in der MRT sowie die Analyse qualitativer SI-Parameter der MR-Myokardperfusion bei Patienten mit koronarer Herzkrankheit wurden mit der 99mTc-SestaMIBI SPECT verglichen. Methode: Bei 16 Patienten mit koronarer Herzkrankheit (KHK) wurde in der MRT mit einer Mehrschichtgradientenechotechnik die Myokardperfusion unter Ruhe- und Belastungsbedingungen untersucht. Qualitative Signalintensitätsparameter der Kontrastmittelanflutung wurden berechnet und die Parameter in normalen, reversibel und persistierend minderperfundierten Myokardarealen miteinander verglichen. Ergebnisse: Normales Myokard zeigte im Gegensatz zu reversiblen (P=0,15) und persistierenden (P=0,07) Ischämien eine signifikante Zunahme der SI-Anstiegssteilheit unter Belastung (P〈0,001). Die SI-Zunahme zeigte ebenfalls nur in normal perfundierten Arealen eine signifikante Zunahme (P〈0,001) nach Belastung. Unter Belastung zeigte sich bei reversiblen Ischämien eine signifikant niedrigere SI-Zunahme als in normalem Myokard (P=0,02), während sich in Ruhe kein Unterschied zeigte. Schlussfolgerung: Qualitative SI-Parameter der kombinierten MR-Perfusionsuntersuchung des Myokards in Ruhe und unter Belastung erlauben die Differenzierung zwischen normalem sowie reversibel oder persistierend minderperfundiertem Myokard.
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  • 83
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 737-744 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter Lymphom ; MRI ; Keywords Lymphoma ; Bone neoplasms ; Diffusion coefficient ; ADC
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Abstract Purpose. Skeletal manifestation of Non-Hodgkin's lymphoma is rare in pediatric patients. Objective of the study was to determine imaging features, before and after treatment, and to correlate these features with clinical outcome. Methods. A retrospective analysis of 1246 patients from two therapy studies (NHL-BMF-90 and 95) was performed. Imaging studies of 63 patients with bone involvement of lymphoma were reevaluated. Results. Incidence of initial bone involvement in Non-Hodgkin's lymphoma was 6.8%. Distribution was best assessed by bone scan, MRI revealed larger areas of marrow involvement and detected additional lesions. Sites of prediliction were long bones of the lower extremities with epiphyseal involvement in 39%. Residual signal alterations in MRI after succussful therapy remained in 71%. Osteonecrosis after therapy was a common finding. Clinical outcome war not correlated to the presence of bone involvement. Conclusions. Since clinical outcome is not effected by bone involvement in childhood NHL, value of screening may be limited. Knowledge of imaging characteristics is mandatory for inital evaluation of primary osseous lymphomas and symptomatic lesions as well as for therapy controlls.
    Notizen: Zusammenfassung Fragestellung. Skelettale Manifestationen des Non-Hodgkin-Lymphoms sind selten. Ziel der Studie waren die Analyse charakteristischer Veränderungen in der Bildgebung vor und nach Therapie sowie die Korrelation mit dem Therapieerfolg. Methode. Die retrospektive Analyse von 2 Therapiestudien (NHL-BMF-90 und 95) schloss 1246 Patienten ein. Die bildgebenden Untersuchungen von 63 Patienten mit skelettalem Lymphombefall wurden reevaluiert. Ergebnisse. Die Inzidenz des initialen Skelettbefalls beim Non-Hodgkin-Lymphom lag bei 6,8%. Die Verteilung der Skelettherde wurde durch die Szintigraphie am sichersten erfasst, die MRT detektierte im Vergleich größere Markraumbeteiligungen sowie zusätzliche Herdbildungen im Skelett. Prädilektionsorte waren die langen Röhrenknochen der unteren Extremitäten mit epiphysärer Beteiligung in 39% der Fälle. Residuale Signalveränderungen im MRT verblieben trotz kompletter Remission in 71% der Fälle. Osteonekrosen nach Chemotherapie waren häufig. Die therapeutische Ergebnisse wurden durch das Vorhandensein eines Skelettbefalls nicht beeinflusst. Schlussfolgerungen. Aufgrund der Beobachtung, dass die Therapieergebnisse vom Nachweis eines Skelettbefalls nicht wesentlich beeinflusst werden, erscheint der Wert der Screeninguntersuchung begrenzt. Die Kenntnis des Erscheinungsbilds vom NHL in der Bildgebung ist aber für die Beurteilung der primär ossären Lymphome und symptomatischer Herdbildungen sowie in der Therapiekontrolle notwendig.
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  • 84
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 2-7 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Neugeborenes ; Frühgeborenes ; Bildgebung ; Key words ; Newborn ; Premature infant ; Diagnostic imaging
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Modern neonatology comprises care for a growing number of infants with congenital abnormalities and an increasing number of premature born infants. The survival rates of premature infants have increased dramati- cally during the past decade. This increase in survival rates can be attributed to improved prenatal and obstetric management and to advances in neonatal intensive care medicine. Radiological support: Neonatology has become a pediatric subspeciality of its own resulting in the demand for an equally specialised radiological support. Therefore the availability of a children´s radiologist for radiological and sonographic examinations is mandatory (24 hours a day) for optimal patient care on a neonatal intensive care unit. A good cooperation between radiologist and neonatologist in neonatal intensive care medicine is therefore warranted.
    Notizen: Zusammenfassung Die moderne Neugeborenenintensivmedizin umfasst neben den typischen neonatalen Krankheitsbildern eine wachsende Zahl kleiner Frühgeborener mit einem Geburtsgewicht 〈1500 g und eine, durch verbesserte pränatale Diagnostik, zunehmend größer werdende Gruppe von Kindern mit komplexen Fehlbildungen. Anforderungen an den Radiologen: Diese Entwicklungen stellen auch an den Radiologen neue Anforderungen; neben der zunehmenden Zahl an Frühgeborenen und ihren speziellen Krankheitsbildern ist auch die Abklärung von speziellen, beim Intensivpatienten auftretenden Problemen erforderlich. Durch die meist gegebene Dringlichkeit der radiologischen Abklärung ist die Verfügbarkeit eines Kinderradiologen rund um die Uhr unabdingbar. Zudem müssen fahrbare Röntgen- und Ultraschallgeräte zur Verfügung stehen, um eine Diagnostik direkt am Krankenbett zu ermöglichen. Diskussion: An einer Neugeborenenintensivstation ist daher eine enge Zusammenarbeit mit dem Kinderradiologen unbedingt notwendig.
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  • 85
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 28-34 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Zerebralinfarkt ; Krampfanfall ; Neugeborenes ; Dopplersonographie ; Vasospasmus ; Key words ; Cerebral artery infarction ; Seizure ; Newborn ; Doppler sonography ; Vasospasm
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary A cerebral artery infarction is an important differential diagnosis in the newborn with neurological abnormalities. Based on clinical data, its incidence is estimated to be 1 in 4000 newborns. Since the course is often subclininal, the true incidence is probably higher. Diagnosis: Cerebral ultrasound and Doppler sonography as readily available screening tools play a central role in the initial diagnosis of neonatal cerebral infarction. Definitive diagnosis is made by computed tomography or magnetic resonance imaging. Beside symptomatic anticonvulsive therapy, treatment aims at the prevention of secondary ischemic injury. Discussion: Three term infants with different clinical courses of neonatal stroke are presented to sensitize the clinician and the radiologist for this probably underdiagnosed entity. The role of imaging modalities in the diagnosis and follow-up of neonatal cerebral infarction is discussed.
    Notizen: Zusammenfassung Ein Infarkt im Stromgebiet der Zerebralarterien stellt eine wichtige Differentialdiagnose bei neurologischen Auffälligkeiten in der Neonatalperiode dar. Die Inzidenz wird anhand von klinischer Daten auf 1:4000 Lebendgeborene geschätzt. Da der Verlauf oft subklinisch ist, liegt die wahre Inzidenz wahrscheinlich höher. Diagnose: Bei der Diagnosestellung kommen dem Schädelultraschall und der Dopplersonographie als leicht verfügbaren Screening-Methoden eine zentrale Rolle zu. Die definitive Diagnose wird, je nach Verfügbarkeit, mittels Computertomographie oder Kernspintomographie gestellt. Die Behandlung ist neben der symptomatischen (antikonvulsiven) Therapie auf die Vermeidung von ischämischen Sekundärschäden gerichtet. Diskussion: Wir wollen mit der vorliegenden Arbeit anhand von 3 Kindern mit verschiedenen klinischen Verläufen eines sog. Neonatal stroke den Stellenwert der bildgebenden Verfahren bei der Diagnostik und Verlaufskontrolle aufzeigen und die Sensibilität für dieses vermutlich unterdiagnostizierte Krankheitsbild erhöhen.
    Materialart: Digitale Medien
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  • 86
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 52-57 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Zentrale Katheter ; Neonatologie ; Radiologie ; Key words ; Central catheter ; Neonatology ; Radiology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Background: Central catheters in neonatological intensive care patients are used for the prolonged application of medicataion or parenteral infusions. Dislocations and septic and thromboembolic complications may occur. Control of position: Radiologically, the correct position of the catheter must be proven. Dislocations or complications associated with central catheters must be diagnosed. For catheter monitoring plain film radiographs are the first line of investigation; however, sonography may be of additional assistance. Angiographic techniques should only be performed when conventional noninvasive methods do not supply satisfactory results. Special knowledge is necessary for monitoring catheters that are set via the umbilical artery or vein. The radiological applications for catheter monitoring in the neonate intensive care unit are discussed in this article.
    Notizen: Zusammenfassung Hintergrund: Die im neonatologischen Krankengut am häufigsten verwendeten Zugänge sind Katheter, die eine prolongierte Verabreichung von Antibiotika, höher osmolarer Lösungen oder evtl. Chemotherapeutika gewährleisten. Komplikationen ergeben sich durch Fehllagen oder sind septischer und thrombembolischer Genese. Lagekontrolle: Für den Radiologen gilt es, eine adäquate Lagekontrolle des Katheters durchzuführen, um Fehllagen zu vermeiden, jedoch auch Komplikationen zu diagnostizieren. Für dieses Kathetermonitoring steht zur Lagekontrolle das Nativbild im Vordergrund, des Weiteren erweist sich jedoch die Sonographie als wesentlicher Pfeiler in der Katheterdiagnostik, insbesondere im Hinblick auf die katheterassoziierten Komplikationen. Angiographische Techniken sollten erst nach Ausschöpfen sämtlicher nichtinvasiver diagnostischer Möglichkeiten durchgeführt werden. Besondere Anforderungen ergeben sich durch die in der Neonatologie verwendeten Zugänge über den Nabel, wobei sowohl Kenntnis der exakten Topographie der Katheterlage als auch der speziellen potentiellen Komplikationen von großer Bedeutung ist. Im Folgenden sollen die radiologischen Aufgaben und Möglichkeiten beim Kathetermonitoring unter besonderer Berücksichtigung spezieller Anforderungen bei neonatologischen Intensivpatienten vorgestellt werden.
    Materialart: Digitale Medien
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  • 87
    Digitale Medien
    Digitale Medien
    Springer
    Der Radiologe 40 (2000), S. 58-62 
    ISSN: 1432-2102
    Schlagwort(e): Schlüsselwörter ; Nekrotisierende Enterokolitis ; Pneumatosis intestinalis ; Pneumoportogramm ; Perforation ; Leeraufnahme des Abdomens ; Sonographie ; Key words ; Necrotizing enterocolitis ; Pneumatosis intestine ; Pneumoportogram ; Perforation ; Plain radiography ; Sonography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Necrotizing enterocolitis (NEC) is a disease of the premature neonate that requires early therapy, sometimes even surgery and therefore early diagnosis. In general, plain radiography of the abdomen and sonography are valuable imaging techniques for diagnosis of NEC. Course of NEC: The disease starts with distension of small bowel loops. Furthermore the children develop pneumatosis in the bowel wall, which is a nonspecific pattern. If the NEC persists, the air passes into the portal vein system, causing a pneumoportogram. Finally, the disease can lead to perforation. In doubtful cases, the plain radiogram must be repeated within a period of 6 h. With sonography distension of the bowel, thickening of and pneumatosis in the bowel wall, the pneumoportogram and free intraperitoneal fluid can be easily depicted. The most common complications of NEC are intestinal stenosis and strictures that can lead to ileus. Differential diagnosis: Focal perforation of ileum, volvulus and Hirschsprung’s disease are some of the differential diagnoses.
    Notizen: Zusammenfassung Die nekrotisierende Enterokolitis (NEC) ist eine schwere Erkrankung des Abdomens bei Frühgeborenen, die einer raschen, nötigenfalls chirurgischen Therapie zugeführt werden muss. Dazu bedarf es einer frühen Diagnose, die mit einer Leeraufnahme des Abdomens und Sonographie gestellt werden kann. Verlauf von NEC: Die NEC beginnt mit einer Dilatation des Darms, zumeist des Dünndarms, in 2. Linie des Dickdarms. Des Weiteren entwickeln sich stehende Schlingen und eine Pneumatosis intestinalis, die ein unspezifisches Zeichen ist und bei allen ischämischen Darmerkrankungen auftreten kann. Beim Fortschreiten der Erkrankung kommt es zum Pneumoportogramm und im schlimmsten Fall zur Perforation. Bei unklaren Abdomenleerbefunden ist eine engmaschige radiologische Kontrolle notwendig. Sonographisch können sowohl die Distension des Darms als auch die Pneumatosis intestinalis als auch das Pneumoportogramm als auch freie Flüssigkeit hervorragend erfasst werden. Spätkomplikationen sind Stenosen und Strikturen, die zu Subileus und Ileus führen können. Differentialdiagnosen: Die Differentialdiagnosen reichen von fokaler Ileumperforation bis hin zu Volvulus und Morbus Hirschsprung.
    Materialart: Digitale Medien
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  • 88
    Digitale Medien
    Digitale Medien
    Springer
    Journal of cancer research and clinical oncology 126 (2000), S. 667-670 
    ISSN: 1432-1335
    Schlagwort(e): Key words Chondrosarcoma ; Heat shock protein ; Differentiation ; Diagnosis ; Immunohistochemistry ; Chondroma
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Purpose: Heat shock proteins (hsp) are involved in tumor immunity, and a correlation with survival, occurrence of metastases, and drug resistance has been reported. It was the aim of this study to investigate the expression of heat shock proteins in chondrosarcomas and chondromas. Methods: Hsp expression was investigated immunohistochemically on paraffin-embedded sections of 37 consecutive patients (24 male and 13 female, mean age 48 years) with chondrosarcoma and of ten patients (six male, four female, mean age 36 years) with chondroma. Results: Chondromas showed a positive staining for hsp27 in 100%, for hsp60 in 30%, for hsp72 in 80%, for hsp73 in 80%, and for hsp90 in 90%. In chondrosarcoma a decreased expression was found for hsp27 (62% positive, P 〈 0.05) and hsp72 (43% positive, P 〈 0.05), whereas no significant difference to chondromas was detected in the expression of hsp60 (49% positive), hsp73 and hsp90 (73% and 81% positive, respectively). In addition, hsp72 expression showed a correlation with differentiation of the tumors (P 〈 0.05); the lowest hsp72 expression was found in G3 chondrosarcomas (only 13% positive). No correlation with respect to differentiation was found for the expression of the other hsps. Conclusions: This study shows a different expression of hsps in chondrosarcomas and chondromas. Together with the correlation of hsp72 expression with low differentiation, this finding could lead to new experimental and diagnostic strategies.
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  • 89
    Digitale Medien
    Digitale Medien
    Springer
    Der Pathologe 21 (2000), S. 433-440 
    ISSN: 1432-1963
    Schlagwort(e): Schlüsselwörterα1-Antitrypsin-Mangel PiZ ; Lebermorphologie ; Immunhistochemie ; “Single-strand conformational polymorphism” ; DNA-Sequenzierung ; Keywords Alpha-1-antitrypsin deficiency PiZ ; Liver morphology ; Immunohistochemistry ; Single-strand conformational polymorphism ; DNA sequencing
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Abstract Whether heterozygotes with alpha-1-antitrypsin (AAT) deficiency type PiZ bear an increased risk for chronic liver disease is controversial. On the basis of liver tissue from 1,030 autopsies (autopsy series), 1,847 biopsies (biopsy series) and 317 primary liver carcinomas (tumor series), we analysed the effect of heterozygous state PiZ for the development of liver diseases. The PiZ status was screened immunohistochemically and verified in selected cases by SSCP analysis and by sequencing DNA extracted from paraffin embedded tissue. The PiZ frequency in the biopsy series (3.4%) and tumor series (5.99%) was significantly higher than in the autopsy series (1.8%). Hepatic PiZ deposits in heterozygotes sometimes were as extensive as in homozygotes. The amount of PiZ deposits correlated positively with the inflammatory activity and stage of fibrosis, as well as with the age of patients. Patients with concurrent liver disease such as hepatitis and alcoholic liver disease showed significantly higher scores of inflammatory activity, stage of fibrosis and amount of PiZ deposits than those without additional liver disease. Cholangiocarcinomas and combined hepato-cholangiocarcinomas were seen significantly more frequently in patients with PiZ-associated liver carcinoma than in genetic healthy individuals (p=0.004). Three out of 19 PiZ-associated liver carcinomas had developed in cirrhotic liver tissue. Heterozygotes of type PiZ have an enhanced risk for chronic liver disease including primary liver carcinoma. PiZ-associated liver diseases will become clinically manifest in middle or old aged adults. Rarely this genetic defect causes liver cirrhosis even without concurrent liver disease. PiZ-associated liver carcinomas are frequently characterized by cholangiocellular differentiation and may develop often in non-cirrhotic liver tissue. Immunohistochemistry is a specific method to detect hepatic PiZ deposits.
    Notizen: Zusammenfassung Bisher ist umstritten, ob heterozygote Patienten mit α1-Antitrypsin (AAT)-Mangel Typ PiZ ein erhöhtes Risiko für Lebererkrankungen aufweisen. An Leberproben von 1030 Autopsien (Autopsie-Serie), 1847 Biopsien (Biopsie-Serie) und 317 primären Leberkarzinomen (Tumor-Serie) sollte der Einfluss des heterozygoten PiZ-Status auf die Leber untersucht werden. Die PiZ-Bestimmung erfolgte immunhistochemisch, teilweise ergänzt durch SSCP-Analyse und DNA-Sequenzierung von DNA-Extrakten aus paraffineingebettetem Material. Die PiZ-Häufigkeit der Biopsie-Serie (3,4%) und der Tumor-Serie (5,99%) war signifikant höher als die der Autopsie-Serie (1,8%). PiZ-Ablagerungen waren bei manchen heterozygoten Merkmalsträgern ebenso umfangreich wie bei homozygoten. Ihr Ausmaß korrelierte positiv mit Entzündungsaktivität und Fibrosegrad der Leber sowie mit dem Patientenalter. Patienten mit konkurrierenden Lebererkrankungen wie Hepatitis oder Alkoholschädigung wiesen eine signifikant stärkere Entzündung, Fibrose und mehr PiZ-Ablagerungen auf als diejenigen ohne zusätzliche Lebererkrankungen. Cholangiokarzinome und kombinierte Hepatocholangiokarzinome traten signifikant häufiger bei Patienten mit PiZ-Mutation als bei genetisch Gesunden (p=0,004) auf. Nur 3 der 19 PiZ-assoziierten Leberkarzinome waren in einer Leberzirrhose entstanden. Patienten mit heterozygotem AAT-Mangel Typ PiZ tragen nach den hier vorgestellten Ergebnissen ein erhöhtes Risiko für chronische Lebererkrankungen einschließlich primärer Leberkarzinome. Wenn überhaupt, manifestiert sich dieser genetische Defekt erst in mittlerem oder höherem Lebensalter. Er kann in seltenen Fällen selbst ohne konkurrierende Lebererkrankung zur Zirrhose führen. PiZ-assoziierte Leberkarzinome sind häufig cholangiozellulär differenziert und entstehen mehrheitlich ohne Leberzirrhose. Hepatische PiZ-Ablagerungen lassen sich immunhistochemisch zuverlässig identifizieren.
    Materialart: Digitale Medien
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  • 90
    Digitale Medien
    Digitale Medien
    Springer
    Pediatric nephrology 14 (2000), S. 629-635 
    ISSN: 1432-198X
    Schlagwort(e): Key words Histomorphometry ; In situ hybridization histochemistry ; Molecular morphometry ; Immunohistochemistry ; Bone
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Quantitative histomorphometric assessment of bone biopsies represents a powerful and informative method for the study of metabolic bone diseases. It is the gold standard against which the noninvasive ”diagnostic” markers of bone metabolism as well as newly available therapeutic modalities are tested. With the rapid progress in technology of molecular biology, identification of systemic and local biomolecules known to regulate bone metabolism can now be achieved. The study of localization, levels of expression, and synthesis of these factors in bone and its microenvironment is possible through applications of in situ hybridization histochemistry (ISHH) and immunohistochemistry (IHC). Application of ISHH allows study of specific mRNA expression. IHC determines the presence and distribution of target protein in cells. These two methodologies provide the link between the cellular processes of mRNA transcription and translation to the working protein. Combining the established bone histomorphometric techniques with ISHH and IHC elevates the study of bone to new heights, i.e., cellular and molecular mechanistic issues can now be studied.
    Materialart: Digitale Medien
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  • 91
    Digitale Medien
    Digitale Medien
    Springer
    Der Pathologe 21 (2000), S. 16-23 
    ISSN: 1432-1963
    Schlagwort(e): Schlüsselwörter Lymphknötchen ; Reaktive Infiltrate ; Maligne Lymphome ; Histotopographie ; Immunhistochemie ; Retikulinfasern ; Knochenmarkbiopsie ; Key words Lymphoid nodules ; Reactive infiltrates ; Malignant lymphomas ; Histotopography ; Immunohistochemistry ; Reticulin fibers ; Bone marrow biopsies
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Differentiation of focal or extended lymphoid bone marrow infiltrates presents a diagnostic challenge and therefore warrants systematic evaluation of those features which affect this. One of the basic requirements is an appropriate technique of processing the bone marrow specimens. This includes the possibility of enzyme evaluation (naphthol-AS-D-chloroacetate esterase) and immunohistochemistry (set of monoclonal antibodies) and comparison with the corresponding lymph node histology. A number of histological parameters have emerged with a distinctive property for distinguishing between reactive focal lymphoid aggregates and malignant lymphomas. Amongst these the pattern of infiltrates, i.e., histotopography (subcortical infiltrates, paratrabcular–endosteal localization, margination, tandem-like extension between adipocytes and cribriform appearance), content of reticulin fibers, cytology (small lymphocytes versus large blast cells) and, finally, immunohistochemistry (monoclonal versus polyclonal expression of cytoplasmic immunoglobulins, uniform versus mixed population of B or T lymphocytes) are most important. In conclusion, synoptic consideration of several parameters, in particular histotopography and immunohistochemistry provides a most promising approach to differentiate neoplastic from reactive lymphoid lesions in the bone marrow.
    Notizen: Zusammenfassung Die Differentialdiagnose herdförmiger oder ausgedehnter lymphoider Knochenmarkinfiltrate stellt noch immer eine diagnostische Herausforderung dar, die eine systematische Analyse entsprechender diskriminierender Faktoren erfordert. Eine der grundsätzlichen Voraussetzungen ist dabei eine Technik mit entsprechender Möglichkeit einer enzym- (Naphthol-AS-D-Chlorazetatesterase) und immunhistochemischen Aufarbeitung (monoklonale Antikörper) des Biopsiematerials und der Vergleich mit der zugeordneten Lymphknotenhistologie. Hinsichtlich der Unterscheidung zwischen reaktiven, herdförmigen lymphoiden Läsionen und malignen Lymphomen hat sich eine Anzahl histologischer Parameter als von wegleitendem diagnostischen Wert herausgestellt. Dazu gehören einmal das Infiltrationsmuster bzw. die Histotopographie (subkortikales Infiltrat, paratrabekulär-endostale Lokalisation, Abgrenzung, tandem-artige Ausbreitung zwischen den Adipozyten und kribriformes Muster), Faserdichte im Infiltrat sowie die Zytologie (kleine Lymphozyten gegenüber großen blastären Zellelementen) und schließlich die Immunhistochemie (mono-gegenüber polyklonaler Expression zytoplasmatischer Immunglobuline, uniforme gegenüber gemischtzelliger B- oder T-Lymphozytenpopulation). Zusammengefaßt verspricht eine gemeinsame Beachtung dieser verschiedenen Merkmale, insbesondere jedoch die Histotopographie und Immunhistochemie, am ehesten eine erfolgreiche Differenzierung zwischen reaktiven und neoplastischen lymphoiden Läsionen des Knochenmarks.
    Materialart: Digitale Medien
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  • 92
    Digitale Medien
    Digitale Medien
    Springer
    Der Pathologe 21 (2000), S. 456-459 
    ISSN: 1432-1963
    Schlagwort(e): Schlüsselwörter Undifferenziertes kleinzelliges Hepatoblastom ; Immunhistochemie ; Keywords Undifferentiated small-cell hepatoblastoma ; Immunohistochemistry ; Prognosis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Abstract Undifferentiated small-cell hepatoblastoma (HB) is a rare malignant tumor of childhood. The cell of origin is supposed to be a pluripotential, probably entodermal, stem-cell. Differential diagnosis of this type of HB is difficult among the group of small round and blue cell malignant tumors of children. The immunohistochemically determined coexpression of cytokeratin 8, 18, and 19 and of vimentin and actin, regularly in the absence of α-fetoprotein expression may be diagnostically helpful. We present the case of an undifferentiated small-cell HB of a 15-month-old girl with agenesis of the right kidney. As morphological peculiarity the tumor presented disseminated histiocytic giant cells.
    Notizen: Zusammenfassung Undifferenzierte kleinzellige Hepatoblastome (HB) zählen zu den seltenen malignen Tumoren der Leber im Kindesalter. Da der Tumor in der Regel kein α-Fetoprotein exprimiert, ist der Nachweis von Zytokeratin 8, 18 und 19 sowie Vimentin und Aktin diagnostisch wegweisend. Als Ausgangszelle wird eine pluripotente, wohl entodermale Stammzelle vermutet. In der Gruppe der klein-, rund- und blauzelligen malignen Tumoren des Kindesalters bietet diese Variante des HB differenzialdiagnostische Schwierigkeiten. Wir berichten über ein undifferenziertes kleinzelliges HB eines 15 Monate alten weiblichen Kleinkindes mit Agenesie der rechten Niere. Als morphologische Besonderheit des Tumors werden disseminierte histiozytäre Riesenzellen beschrieben.
    Materialart: Digitale Medien
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  • 93
    Digitale Medien
    Digitale Medien
    Springer
    Der Pathologe 21 (2000), S. 39-54 
    ISSN: 1432-1963
    Schlagwort(e): Schlüsselwörter Chronische myeloische Leukämie ; Megakaryozyten ; Fasern ; Erythropoese ; Makrophagen ; Klinische Befunde ; Immunhistochemie ; Knochenmarkbiopsie ; Key words Chronic myelogenous leukemia ; Megakaryocytes ; Fibers ; Erythroid precursors ; Macrophages ; Clinical findings ; Immunohistochemistry ; Morphometry ; Bone marrow biopsies
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary An immunohistochemical and morphometric study was performed on bone marrow biopsies in 604 patients with chronic myelogenous leukemia (CML) to compare morphological and clinical features and to evaluate effects of interferon (IFN) and chemotherapy. Following morphometry significant correlations were calculated between number of CD61+ megakaryocytes, including their precursors with fiber density. This finding is in line with the close functional relationship between megakaryopoiesis and fibroblasts regarding the complex pathomechanism of myelofibrosis. The latter was observed in about 28% of patients already at diagnosis. In a similar way, the frequency of CD68+ macrophages was correlated with the amount of Ret40f+ nucleated erythroid precursors, implicating an involvement of this cell lineage in iron turnover, hemoglobin synthesis, and degradation of the expelled nuclei from normoblasts. The (α-D-galactosyl residue-expressing) Pseudo-Gaucher cells were detectable in 30% of pretreatment specimens. Moreover, significant associations were calculable between reduction in erythropoiesis or increase in fibers with clinical features such as hemoglobin level, percentages of myelo- and erythroblasts in the peripheral blood, and spleen size. These variables are in keeping with more advanced stages of CML. Based on our morphometric evaluations, a classification into three different histological subgroups: granulocytic, megakaryocytic, and myelofibrotic was carried out. This simplified staging system was correlated with corresponding sets of hematological data. Sequential biopsies in 173 patients with monotherapy by IFN, hydroxyurea (HU), or busulfan (BU) revealed a fibrogenic effect of IFN in contrast to a fiber-reducing property of HU. The dynamics of myelofibrosis and changes of major cell lineages during treatment were readily demonstrable by calculating corresponding indices. These included the ratios between quantitative differences of corresponding variables at repeated examinations and time. Thus, in patients with complete hematological remission following IFN administration, regeneration of erythropoiesis was found to be accompanied by an increase in the total number of CD68+ macrophages, including activated subpopulations. Histological subgroups showed a transition from a (nonfibrotic) granulocytic and megakaryocyte pattern to the myelofibrotic subtype in about 40% of patients. This change was opposed to a numerical reduction in the myelofibrotic subtype which occurred in 17 patients (36%), but predominantly in those under HU therapy. In conclusion, the striking heterogeneity of bone marrow features in CML warrants a careful morphological evaluation of trephine biopsies and appropriate means of processing to achieve relevant correlations with clinical data and, thus, allows a more elaborate insight into the dynamics of the disease process.
    Notizen: Zusammenfassung Bei 604 Patienten mit einer chronischen myeloischen Leukämie (CML) wurde anhand von Beckenkammbiopsien eine immunhistochemische und morphometrische Studie durchgeführt, um morphologische und klinische Befunde miteinander zu vergleichen und die Auswirkungen der Interferon- (IFN) und Chemotherapie abzuklären. Anhand der morphometrischen Analyse konnten signifikante Korrelationen zwischen der Anzahl CD61+-Megakaryozyten einschließlich ihrer Vorläuferzellen mit der Faserdichte berechnet werden. Dieser Befund spiegelt die enge funktionelle Beziehung zwischen der Megakaryopoese und den Fibroblasten im Hinblick auf den komplexen Pathomechanismus der Myelofibroseentstehung wider. Diese war bei etwa 28% der Patienten bereits zum Diagnosezeitpunkt zu beobachten. In ähnlicher Weise war die Anzahl der CD68+-Makrophagen mit der Menge an Ret40f+-kernhaltigen erythropoetischen Vorläuferzellen korreliert, was durch die Einbindung dieser Zellinie in den Eisenstoffwechsel, die Hämoglobinsynthese sowie den Abbau der ausgestoßenen Normoblastenkerne in Zusammenhang gebracht werden kann. Die (α-D-Galaktosylreste-expremierende) Pseudo-Gaucherzellen ließen sich in 30% der Biopsien vor Behandlung nachweisen. Weiterhin konnten signifikante Beziehungen zwischen einer Reduktion der Erythropoese oder einer Zunahme der Verfaserung mit klinischen Parametern wie dem Hämoglobinspiegel, dem Anteil an Myelo- und Erythro-Normoblasten im peripheren Blut und der Milzgröße berechnet werden. Diese Variablen kennzeichnen offensichtlich mehr fortgeschrittene Stadien der CML. Entsprechend unserer morphometrischen Auswertung wurde eine Klassifikation in drei unterschiedliche histologische Subgruppen vorgenommen: granulozytisch, megakaryozytisch und myelofibrotisch. Dieser vereinfachten histologischen Einteilung waren entsprechende hämatologische Daten zuzuordnen. Sequenzbiopsien an 173 Patienten, die eine Monotherapie mit IFN, Hydroxyurea (HU) oder Busulfan (BU) erhielten, zeigten einen fibrogenetischen Effekt von IFN im Gegensatz zu einer eher faserreduzierenden Eigenschaft von HU. Die Dynamik der Myelofibroseentwicklung und die entsprechende Veränderungen der hauptsächlichen Zellinien während der Behandlung ließen sich am besten durch eine Kalkulation von Indizes verdeutlichen. Diese beinhalteten das Verhältnis aus quantitativen Unterschieden der einzelnen Variablen in den wiederholt durchgeführten Entnahmen und den zugeordneten zeitlichen Differenzen. So war bei Patienten mit einer kompletten hämatologischen Remission nach IFN-Gabe die Regeneration der Erythropoese zusammen mit einem Anstieg in der Anzahl CD68+-Makrophagen einschließlich ihrer aktivierten Subpopulation auszumachen. Die histologischen Subgruppen ließen bei fortlaufenden Untersuchungen einen Übergang sowohl von einem (nicht verfaserten) granulozytären wie auch megakaryozytären Subtyp in eine myelofibrotische Gruppe bei etwa 40% der Patienten erkennen. Dieses Phänomen stand im Gegensatz zu einer anzahlmäßigen Reduzierung des myelofibrotischen Typs vor allem bei Patienten unter HU-Therapie in 17 Fällen (36%). Zusammengefaßt erfordert die auffallende Heterogenität der Knochenmarkbefunde bei der CML eine sorgfältige morphologische Auswertung von Biopsien mit geeigneten Methoden, um relevante Korrelationen zwischen klinischen Daten zu berechnen und somit einen besseren Einblick in die Dynamik der Krankheitsentwicklung zu gewinnen.
    Materialart: Digitale Medien
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  • 94
    Digitale Medien
    Digitale Medien
    Springer
    Der Pathologe 21 (2000), S. 211-217 
    ISSN: 1432-1963
    Schlagwort(e): Schlüsselwörter Harnblase ; WHO-Klassifikation ; Flache und papilläre urotheliale Läsionen/Tumoren ; Histologie ; Immunhistochemie ; Keywords Urothelial bladder tumors ; WHO classification ; Flat and papillary urothelial lesions/tumors ; Histology ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Abstract Recently the World Health Organization published a new classification of urinary bladder tumors which is intended to take into account better the biology of the various lesions and to better distinguish between clearly benign and malignant lesions. We examine the possible diagnostic and clinical impact of the new classification, including recent immunohistochemical findings. Papillary urothelial lesions include papillomas, papillary neoplasms of low malignant potential, and papillary carcinomas. Flat urothelial lesions include hyperplasia, reactive atypia/atypia of unknown significance, dysplasia, and carcinoma in situ. Invasive patterns of papillary carcinomas are discussed, with special emphasis on lamina muscularis mucosae substaging. The most important feature of the new classification is its differentiation of two types of low-grade, noninvasive papillary urothelial lesions: papillary neoplasm of low malignant potential vs. papillary carcinoma. Long-term follow-up studies are needed to determine the clinical significance of this differentiation.
    Notizen: Zusammenfassung Grund für die Aktualisierung der WHO-Klassifikation urothelialer Läsionen bzw. Tumoren der Harnblase war, der Biologie der verschiedenen Läsionen besser gerecht zu werden sowie eine schärfere Trennung zwischen benignen und malignen urothelialen Prozessen zu vollziehen. Die Bedeutung für Diagnostik und Klinik im Alltag unter Berücksichtigung aktueller immunhistochemischer Befunde wird kritisch betrachtet. Zwei Hauptgruppen werden unterschieden. Papilläre urotheliale Läsionen umfassen Papillome, papilläre urotheliale Neoplasien niedrig malignen Potentials sowie papilläre Karzinome. Flache urotheliale Läsionen umfassen flache Hyperplasien, Atypien (reaktiv oder von unklarer Bedeutung), Dysplasien sowie das Carcinoma in situ (CIS). Verschiedene Invasionsmuster papillärer Karzinome werden unter besonderer Berücksichtigung der Lamina muscularis mucosae diskutiert. Der kritischste Punkt der neuen Klassifikation sowohl für die Diagnostik als auch für die Klinik dürfte die Unterscheidung zweier Gruppen nichtinvasiver papillärer “low-grade”-Tumoren (papilläre urotheliale Neoplasie niedrig malignen Potentials vs. pTa-GI-Tumor) darstellen. Langzeit-follow-up-Studien müssen zeigen, ob diese Unterteilung ihre Berechtigung findet.
    Materialart: Digitale Medien
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  • 95
    Digitale Medien
    Digitale Medien
    Springer
    Neuroradiology 42 (2000), S. 290-295 
    ISSN: 1432-1920
    Schlagwort(e): Key words Blake's pouch cyst ; Dandy-Walker complex ; Dandy-Walker malformation ; Posterior fossa malformation ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Abnormal cerebrospinal fluid (CSF) collections within the posterior fossa are defined by the Dandy-Walker complex (DWC) and by arachnoid cysts (AC). The DWC includes the Dandy-Walker malformation (DWM), the Dandy-Walker variant (DWV) and the mega-cisterna magna (MCM). In addition, Tortori-Donati et al. added persistent Blake's pouch cyst (BPC) as an independent entity within the DWC. BPC represents a posterior ballooning of the superior medullary velum into the cisterna magna. All of these malformations are overlapping developmental anomalies characterized by varying degrees of malformation of the medullary vela, the cerebellar vermis and hemispheres, the fourth ventricle choroid plexus, the posterior fossa subarachnoid cisterns and the enveloping meningeal structures. We present two cases of persistent BPC detected in two adult women without history of gestational or subsequent growth problems. They underwent neuroradiological investigation because of headache and because of recurrent episodes of loss of consciousness, respectively. The MRI findings included tetraventricular hydrocephalus, wide communication of the fourth ventricle and the cystic posterior fossa (i. e. BPC), inferior posterior fossa mass effect with or without hypoplasia of both the cerebellar vermis and the medial aspects of the cerebellar hemispheres, and absence of communication between fourth ventricle and the basal subarachnoid space in the midline posteriorly. Persistent BPC is defined by a failure of embryonic assimilation of the area membranacea anterior within the tela choroidea associated with imperforation of the foramen of Magendie. Typically this condition becomes symptomatic early in life. In the current cases the normal function of the laterally positioned foramina of Luschka probably helped to maintain some CSF flow between intraventricular and subarachnoid spaces, with the establishment of a precarious equilibrium characterized by a compensatory enlargement of the cerebral ventricular system (i. e. hydrocephalus).
    Materialart: Digitale Medien
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  • 96
    ISSN: 1432-1262
    Schlagwort(e): Keywords Fecal incontinence ; Constipation ; MRI ; Ultrasound
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  This study assessed the value of common surface coil mag-netic resonance imaging (MRI) in patients with evacuatory disorders including fecal incontinence and constipation. These findings were then compared with those from other standard physiological examinations and/or surgical findings. From July 1996 to June 1997, 14 consecutive patients underwent surface coil MRI for evaluation of either fecal incontinence (n=5) or constipation (n=9). In patients with incontinence we compared the findings from endoanal ultrasound (EAUS), anal MRI, and surgery regarding morphopathological findings of the internal and external anal sphincter components. In constipated patients the findings of videoprography and dynamic pelvic MRI were compared regarding the presence of rectocele, rectoanal intussusception, and sigmoidocele as well as the measurements of anorectal angle and perineal descent. The five incontinent patients were all women, with a median age of 67 years (range 43–77). EAUS revealed an anterior sphincter defect in two patients, a posterior defect in one, and normal anal sphincter images in two. Surgical findings confirmed an anterior external anal sphincter scar in two patients, an internal anal sphincter defect in one, and an anatomically normal anal sphincter in two. In one patient, although anal MRI showed posterior external anal sphincter defect, EAUS and surgery revealed normal external anal sphincter appearance. The accuracy rate between EAUS and anal MRI was only 20%, that between surgery and anal MRI 40%, and that between surgery and EAUS 80%. Thus EAUS was more accurate than anal MRI in incontinent patients. The nine constipated patients were all women, with a mean age of 59 years (range 40–78). Videoproctography revealed an anterior rectocele in six patients, rectoanal intussusception in three, and sigmoidocele in five; no abnormalities were identified in two patients. On dynamic pelvic MRI anterior rectocele was seen in three patients and sigmoidocele in two, and five studies were interpreted as normal. One of the patients underwent sigmoidectomy for sigmoidocele, and five patients were treated by biofeedback. Thus the accuracy rate of dynamic pelvic MRI against videoproctography was 60% for anterior rectocele, 40% for sigmoidocele, and zero for rectoanal intussusception. In conclusion, neither MRI for the evaluation of patients with fecal incontinence nor for the evaluation of patients with constipation added any significant information that would warrant its continued use in these patient groups. Perhaps the more widespread availability of an endoanal coil will alter this conclusion; however, at the present time we cannot routinely endorse the expense, time, or inconvenience of these MRI investigations in patients with these diagnoses. Larger prospective comparative studies are required prior to endorsing the technique.
    Materialart: Digitale Medien
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  • 97
    Digitale Medien
    Digitale Medien
    Springer
    Child's nervous system 16 (2000), S. 731-734 
    ISSN: 1433-0350
    Schlagwort(e): Keywords Children ; Brain ; Tumour ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  The author reviews the progress made during the last 25 years in noninvasive diagnosis of brain tumours in children. MRI has replaced all other modalities available at that time. The diagnosis is still based on a precise anatomical analysis of the lesion rather than on other specific findings. New techniques, such as spectroscopy and diffusion, may help to characterise further brain tumours in children preoperatively.
    Materialart: Digitale Medien
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  • 98
    Digitale Medien
    Digitale Medien
    Springer
    Der Nervenarzt 71 (2000), S. 411-415 
    ISSN: 1433-0407
    Schlagwort(e): Schlüsselwörter Kufs ; Neuronale Zeroidlipofuszinose ; Demenz ; PET ; MRT ; Key words Kufs disease ; Neuronal ceroid lipofuscinosis ; Dementia ; PET ; MRI
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary The case of a 35-year-old man with progressive dementia from the age of 17 is presented. Clinical examination showed mild extrapyramidal and cerebellar signs and rare myoclonus. Neuropsychological evaluation disclosed severe cognitive deficits. Magnetic resonance imaging (MRI) revealed moderate generalized atrophy with abnormal iron deposition in the basal ganglia. Positron emission tomography (PET) with 18-fluorodeoxyglucose (18-FDG) demonstrated clear temporoparietal hypermetabolism. The clinical symptoms and course are typical for the rare adult type of neuronal ceroid lipofusconoses (Kufs' disease). The diagnosis is supported by the electron microscope detection of an abnormal accumulation of lipid vacuoles and lipofuscin in the eccrine sweat glands and the rectal ganglia cells.
    Notizen: Zusammenfassung Berichtet wird der Fall eines 35-jährigen Patienten mit langsam progredienter Demenz seit dem 18. Lebensjahr. Zum Zeitpunkt der Untersuchung fielen klinisch eine leichtgradige extrapyramidale und zerebelläre Symptomatik sowie seltene Myoklonien auf, während die neuropsychologische Testung ausgeprägte kognitive Defizite ergab. Die kraniale Magnetresonanztomographie zeigte eine mäßige globale Atrophie und eine abnorme Eisenablagerung in den Basalganglien. In der Positronenemissionstomographie mit 18-FDG war ein deutlicher temporoparietaler Hypometabolismus erkennbar. Klinik und Verlauf sind typisch für die seltene adulte Variante der neuronalen Zeroidlipofuszinosen (Kufs-Typ). Diese Diagnose wird gestützt durch den elektronenmiroskopischen Nachweis abnormer Akkumulationen von Fettvakuolen und Lipofuszinablagerungen in den ekkrinen Schweißdrüsen der Haut und in den rektalen Ganglienzellen.
    Materialart: Digitale Medien
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  • 99
    Digitale Medien
    Digitale Medien
    Springer
    HNO 48 (2000), S. 75-90 
    ISSN: 1433-0458
    Schlagwort(e): Schlüsselwörter ; 3D-Navigation ; Rahmenlose Stereotaxie ; Computerunterstützte Chirurgie ; Intraoperative Navigation ; Key words ; 3D-navigation ; Frameless stereotaxy ; Computer aided surgery ; CAS ; Intraoperative navigation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary 3D-navigation systems have only recently been introduced into the surgical field. Since then they have gained increasing importance not only in ENT surgery but also in neurosurgery, orthopedic surgery, maxillo-facial surgery, radiology and radiotherapy. Following a brief historical introduction this article reviews existing navigation technologies, in terms of indication, practicability, accuracy, forensic and financial aspects. The selection of the navigation system is strongly influenced by the planned procedure (endoscopic, microscopic, open approach). According to our experience most of these systems provide useful support intraoperatively. The clinical application accuracy regularly lies in the range of 1–2 mm.
    Notizen: Zusammenfassung Seit der Entwicklung und der kommerziellen Verfügbarkeit von intraoperativen 3D-Navigationssystemen hat diese Technologie nicht nur in der Hals-Nasen-Ohrenchirurgie sowie der Neurochirurgie, sondern auch anderen Disziplinen, wie Orthopädie, Kieferchirurgie, Strahlentherapie und Radiologie an Bedeutung gewonnen. Nach einem kurzen historischen Überblick werden unterschiedliche Navigationstechnologien in ihrer Arbeitsweise dargestellt und anhand von klinischen Anwendungen verdeutlicht. Die Auswahl des geeigneten Navigationssystems richtet sich nach der Art des geplanten Eingriffs (endoskopisch, mikroskopisch, kombiniert). Durch intensive Weiterentwicklung dieser Systeme leisten sie bereits heute eine wertvolle Unterstützung für den HNO-Chirurgen. Die derzeit erzielbare intraoperative Genauigkeit liegt für die meisten Systeme regelhaft bei 1–2 mm.
    Materialart: Digitale Medien
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  • 100
    ISSN: 1433-0458
    Schlagwort(e): Schlüsselwörter ; Autogene Knorpeltransplantation ; Makroverkapselung ; Tissue engineering ; Polyelektrolytkomplexmembran ; Key words ; Cartilage ; Autogenous transplantation ; Encapsulation ; Polyelectrolyte complex membrane ; Tissue engineering
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary In reconstruction of cartilage defects, autogenous transplantation is known as a reliable and experienced method. Although a clinical application has not been reported until now, tissue engineering permits in vitro production of autogenous cartilage transplants. Nevertheless, in both methods the cartilage is exposed to individually varying resorptive mechanisms. Among other methods for in vivo tissue protection, the encapsulation with a semipermeable polyelectrolytecomplex membrane could guarantee sufficient protection against resorptive influences. Human septal cartilage was encapsulated (group 1) with polyelectrolytecomplex membranes and subcutaneously implanted on the back of thymusaplastic nude mice. Cartilage implants without encapsulation (group 2) were used as control. Scanning electron microscopy and histochemical investigations were performed 1, 4, 8, 12 and 16 weeks after implantation. Group 1 showed no signs of resorption and chronic inflammation at all. In contrast, group 2 presented, correlating to the time of implanta-tion, increasing signs of cell death and fibrotic transformation, representing an increased activity of resorption. In conclusion, tissue encapsulation with a polyelectrolytecomplex membrane could ensure a sufficient protection of human cartilage transplants from resorptive influences. For the plastic-reconstructive surgeon the desired result becomes more calculable.
    Notizen: Zusammenfassung In der rekonstruktiven Chirurgie könnte neben der etablierten Methode der autogenen Knorpeltransplantation das Tissue engineering humaner Knorpelgewebe zunehmend an Bedeutung gewinnen. Resorptive Mechanismen können jedoch bei beiden Methoden zu funktionell und kosmetisch unbefriedigenden Ergebnissen führen. Unter den heute zur Verfügung stehenden Verfahren der Gewebeprotektion könnte die Polyelektrolytmembranverkapselung mit Natriumzellulosesulfat und Polydialylldimethylammoniumchlorid einen ausreichenden Schutz vor resorptiven Einflüssen gewährleisten. Humaner nativer Nasenseptumknorpel wurde verkapselt (Gruppe 1) und unverkapselt (Gruppe 2) subkutan in thymusaplastische Nacktmäuse implantiert. Die Transplantate wurden nach 1, 4, 8, 12 und 16 Wochen explantiert und histologisch sowie rasterelektronenmikroskopisch untersucht. Gruppe 1 zeigte über den gesamten Implantationszeitraum keinerlei Resorptionsmerkmale bei vollständig erhaltener Knorpelgrundsubstanz. Gruppe 2 hingegen zeigte, korrelierend mit der Implantationsdauer, in zunehmendem Maße Knorpelzellnekrosen und einen bindegewebigen Umbau im Sinne einer Resorption. Die Polyelektrolytmembranverkapselung könnte somit eine sichere Methode zum Schutz humaner Knorpeltransplantate vor resorptiven Einflüssen darstellen. Für den Plastisch-rekonstruktiven Chirurgen wird hierdurch das gewünschte kosmetische und funktionelle Ergebnis kalkulierbarer.
    Materialart: Digitale Medien
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