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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Histopathology 45 (2004), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Vascular endothelial growth factor expression correlates with tumour grade and vascularity in gliomas Aims: Tumour vascularity and vascular endothelial growth factor (VEGF) expression were studied in 41 primary brain tumours of astrocytic and oligodendroglial origin, in order to define the potential role of VEGF in the vascularization and growth of these tumours. Methods and results: Two commercial monoclonal antibodies to the VEGF protein (from R&D Systems and NeoMarkers), raised against different isoforms, were utilized. Each monoclonal antibody consistently detected the expression of VEGF in different cell types. The R&D Systems antibody only produced surface staining of endothelial cells in tumour capillaries, whereas staining with the Neomarkers antibody was largely confined to tumour cell cytoplasm. High levels of staining were seen with the R&D Systems and NeoMarkers antibodies in 13 and 14 of 15 glioblastomas, respectively, four and three of five oligodendrogliomas, four and seven of 10 anaplastic astrocytomas, one and three of six low-grade astrocytomas and none and none of five pilocytic astrocytomas. There was a close correlation between VEGF expression, tumour vascularity and grade. Conclusions: These findings support a role for VEGF in the angiogenesis of glioblastoma, anaplastic astrocytoma and oligodendroglioma. The distinct immunoreactivities of the two commercial monoclonal antibodies indicate either there is expression of different splice variants of VEGF or that the epitopes are differentially revealed during synthesis, secretion and receptor-binding of the growth factor. This highlights the importance of using more than one antibody in the evaluation of tissue VEGF expression.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Histopathology 42 (2003), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Less invasive or non-invasive alternatives to the complete autopsy have been sought for some time, and a range of methods, ranging from needle sampling to endoscopy to magnetic resonance imaging, have been considered. Evaluations of these methods are few and far between, but generally confirm the predictable conclusion that incomplete autopsies provide incomplete information. It is not difficult to envisage a situation whereby pressure for non-invasive autopsies will allow them to become prevalent, whether properly evaluated or not. However, used appropriately, non-invasive or less invasive autopsies may be valuable tools capable of answering specific questions in situations where it is not possible to perform a complete autopsy.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, U.K. and Cambridge, USA : Blackwell Science Ltd
    Histopathology 33 (1998), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: To study the clinical and histopathological features of sclerosing epithelioid fibrosarcoma, and to define diagnostic criteria for this uncommon soft-tissue tumour.〈section xml:id="abs1-2"〉〈title type="main"〉Methods and resultsStandard histological, immunohistochemical and ultrastructural techniques were applied to five tumours from head and neck, chest wall and groin. Tumours consisted of groups of monomorphic rounded/epithelioid cells surrounded by a prominent collagenous stroma. Tumour cells showed positive vimentin staining but were negative for other markers. They contained prominent rough endoplasmic reticulum and a large Golgi apparatus which in one case was producing collagen secretion granules, an ultrastructural marker for collagen production. Three patients had medium to long-term survival (3–7 years). Of these, one was disease-free for 3 years, and two experienced multiple recurrences: one of the latter died of metastatic disease.〈section xml:id="abs1-3"〉〈title type="main"〉ConclusionCriteria for diagnosing this uncommon tumour include: small to medium cell size, clear or pale cytoplasm, cellular arrangement in cords and strands, dense collagenous stroma; vimentin staining; rough endoplasmic reticulum and a Golgi apparatus producing, in well preserved examples, collagen secretion granules. The paper emphasizes the value of electron microscopy, supporting an appropriate histological picture and immunophenotype, in identifying these relatively low-grade sarcomas.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Aim:  To determine the accuracy and define the limitations of post mortem magnetic resonance imaging (MRI) in determining the cause of sudden death in adults.Methods and results:  Sudden unexpected adult deaths in the community, reported to the Coroner (n = 10), excluding suspicious, violent or potentially drug-related deaths, were submitted to whole body MRI, followed by full invasive autopsy. The MRI scans were reported independently by four radiologists, blinded to the autopsy findings; two had previous experience of post mortem MRI. An abnormality that related to the cause of death as identified at autopsy, was identified by at least one radiologist in eight cases. These were pulmonary consolidation (autopsy finding pneumonia) (n = 1), pneumoperitoneum (autopsy finding perforated peptic ulcer) (n = 2), left ventricular failure (autopsy finding ischaemic heart disease) (n = 4), and disseminated bronchial carcinoma (n = 1). However, in only one case were all radiologists able to provide a confident cause of death (disseminated bronchial carcinoma). In two cases, in which death occurred 2–6 days and 3–6 days before MRI, early decomposition prevented interpretation of the images. Severe coronary artery atheroma was detected at autopsy in 7/10, but these lesions were not detected by MRI. Previous experience in reporting post mortem MRI, without autopsy comparison, did not result in more accurate interpretation of the images.Conclusions:  This pilot study suggests that post mortem MRI can identify some abnormalities relating to the common causes of sudden death in adults, but there is a need for greater experience in correlating MRI with autopsy findings before a reliable cause of death can be made by MRI alone. Inability to image coronary artery lesions, differentiating thrombus from clot and pulmonary oedema from pneumonic exudates, are specific problems that may be corrected with greater experience and higher resolution scans.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular histology 22 (1990), S. 73-80 
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Mast cell granules contain a variety of N-linked saccharides. Heterogeneity of the expression of these saccharides in mast cells was studied in rodent and human tissues which were so selected as to contain all the mast cell subsets previously identified using other criteria. Dermal and intestinal mucosal mast cells were stained with lectins using an avidin-biotin system. It was found that dermal and subepidermal mast cells in the rat and mouse, and mucosal and dermal human mast cells showed very similar lectin binding properties to each other, with a fine variation in the inlensity of staining with certain lectins. Rat mucosal mast cells, however, showed a distinctive pattern of lectin binding which was not seen in mast cells from any other tissue studied. The chemical basis of the differences seen were deduced and the possible significance of these structural variations is discussed.
    Type of Medium: Electronic Resource
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