Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 4 (1965), S. 538-558 
    ISSN: 1432-0533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die vorliegende Arbeit behandelt das histochemische Verhalten der Dehydrogenasen verschiedener Zelltypen in Tumoren des Nervensystems. Die von uns beobachteten Unterschiede in den Reaktionsergebnissen wurden nach den folgenden Gesichtspunkten untersucht: a) Beschreibung der histochemischen Reaktionen in den verschiedenen Tumortypen. b) Reaktionsunterschiede im Zusammenhang mit dem Differenzierungsgrad der Zellelemente, der embryonalen Grundlinien folgt. c) Reaktionsunterschiede in Abhängigkeit von Proliferationszonen mit zahlreichen atypischen Mitosen und ungenügender Zellreife. d) Unterschiede im Zusammenhang mit reaktiven oder regressiven Vorgängen.
    Notes: Summary The present research has pointed out some histochemical aspects of the oxidative metabolism of the various types of cells present in tumors of the nervous system. The variations in the reactions we observed were examined from the following points of view: a) Description of histochemical reactions in the various oncotypes. b) Variations in relation to the stage of differentiation of cellular elements, the evolution of which follows embryogenetic lines. c) Variations in relation to arrangements showing rapid growth with numerous and atypical mitoses and a deficient maturation of the cell. d) Variations in relation to reactive or regressive processes.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 0942-0940
    Keywords: Linear accelerator ; localization ; stereotactic radiotherapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The authors describe a new instrumentation for repositioning of the Brown-Roberts-Wells (BRW) stereotaxic system, useful for precise fractionated radiotherapy. A lucite ring is fixed to the patient's skull with four screws. Another ring, partially open, is then firmly connected co-axially to the lower part of the first one with four spacer-bars. The fixture permits an exact repositioning of the B.R.W. stereotaxic system, placing the target point in the linear accelerator isocenter. The preliminary technical results obtained in five children are reported and the fixture performance, advantages, and perspectives are discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 0942-0940
    Keywords: Localization ; instrumentation ; sterotaxis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The authors describe a new method for reproducible, non-invasive fixation of a stereotaxic localizing frame. A localizing system similar to that of Brown-Roberts-Wells for MR can be fixed at the base of the facial skeleton to the upper dental arch by an orthodontic resin plate. Results of trials with CT scan, advantages and disadvantages are discussed. The new fixture could be employed in open surgery and in fractionated radiotherapy.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die oxydative Aktivität von sich teilenden Zellen in Tumoren des Nervensystems und in deren Gewebskulturen wurde mit Hilfe einer verbesserten Dehydrogenase-Feulgen-Methode untersucht. Die Ergebnisse können wie folgt zusammengefaßt werden: 1. Sowohl in den undifferenzierten als auch in den typischen differenzierten Tumoren zeigten mitotische Zellen eine konstante Zunahme der oxydativen Aktivität im Vergleich zu Zellen gleichen Typs des Umgebungsgewebes. 2. Zellen atypischer Tumoren mit atypischer Mitose zeigten niemals eine Zunahme oxydativer Aktivität im Vergleich zu gleichartigen Zellen des Umgebungsgewebes. In gleicher Weise war keine Zunahme der oxydativen Aktivität in Zellen festzustellen, die sich in amitotischer Teilung befanden. 3. In 12 bis 20 Tagen alten Gewebskulturen war die metabolische Aktivität der sich teilenden und der ruhenden Zellen unverändert im Vergleich zu den Zellen der Originaltumoren. Es wurden sowohl typische Mitosen als auch Amitosen in den mesodermalen Zellen gefunden: Die oxydative Aktivität erwies sich darin nur in Zellen mit typischer Mitose als erhöht. Sie blieb während des amitotischen Prozesses unverändert. Die Ergebnisse und die damit zusammenhängenden Fragen werden besprochen.
    Abstract: Résumé Avec la mise au point d'une méthode combinée de deshydrogénase-Feulgen, on étudie l'activité oxydative des cellules en mitose. Nos résultats peuvent Être ainsi résumés: I. Dans les cellules en mitose typique des tumeurs indifférenciées et différenciées typiques, l'activité oxydative est augmentée si on la compare avec celle des cellules environnantes du mÊme type. II. Au contraire, dans les cellules en mitose atypique des tumeurs atypiques, l'activité oxydative n'est jamais augmentée si on la compare avec celle des cellules environnantes du mÊme type. De mÊme, l'activité oxydative n'est jamais augmentée dans les cellules en amitose. III. Dans les cellules des tumeurs en culture de 12 à 20 jours, l'activité oxydative est la mÊme que celle des cellules des tumeurs d'origine. Dans les cellules mésodermiques, on a trouvé des mitoses typiques et des amitoses: l'activité oxydative est augmentée seulement dans les premières. Ces données et d'autres encore sont discutées.
    Notes: Summary By improving a combined dehydrogenase-Feulgen method, the oxidation activity of the dividing cells in tumours of the nervous system and in their tissue cultures was studied. Our results can be summarized as follows: I. Cells in typical mitosis belonging to undifferentiated and typically differentiated tumours showed a constant increase in the oxidation activity in comparison with the surrounding cells of the same type. II. On the contrary, cells in atypical mitosis of the atypical tumours never showed an increase in the oxidation activity in comparison with the surrounding cells of the same type. Likewise, no increase in the oxidation activity was present in parenchymal cells in amitotic division. III. In the 12–20 day tissue cultures the metabolic activities of the dividing and resting cells remained unmodified in comparison with the cells of the tumour of origin. Typical mitoses and amitoses were found in mesodermal cells too: the oxidation activity appeared to be increased in the cells showing typical mitoses and remained unmodified during the amitotic process. These and other collateral data are discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Child's nervous system 5 (1989), S. 193-193 
    ISSN: 1433-0350
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 31 (1990), S. 512-522 
    ISSN: 1432-1920
    Keywords: Occult spinal dysraphism ; Lipoma ; Tethered cord ; Spinal cord ; Caudal regression syndrome ; Developmental mass lesions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We present a retrospective study of occult spinal dysraphism in 47 children aged 0 to 14 years, all studied with plain X-rays, 60% with CT and myelo-CT, and 40% with MR. We consider the classification and grading of these malformations, clinical, neuroradiological patterns, and indications for surgery. In the light of our findings and of the published data MR emerges as the key investigation. Only in a few cases of great anatomical complexity is it now necessary to perform CT and myelo-CT as well. A case in point is when the conus and thickened filum terminale are inextricably bound together and can no longer be considered separate structures. We propose the term “neurofibrous structure” to define the conus-thickened-filum-terminale unit when these structure are no longer distinguishable.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1432-1920
    Keywords: Key words Ependymoma ; Posterior cranial fossa ; Children ; Magnetic resonance imaging ; Computed tomography ; Brain tumours
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We studied nine children with posterior cranial fossa ependymomas to identify specific neuroradiological features. Patients were studied preoperatively with CT and MRI; T1-, T2- and proton-density (PD)-weighted images were obtained. All children underwent surgery and a definite histopathological diagnosis was made. All the tumours grew into the fourth ventricle and caused dilatation of its upper part, which resembled a cap. All but one were separated from the vermis by a cleavage plane. In eight cases there was desmoplastic development through the foramina of the fourth ventricle, and five were heterogeneous due to necrosis and cystic change; one had a haemorrhagic area. In most cases the solid portion was isointense with grey matter on T1-weighted images, hyperintense on PD weighting, and isointense on T2-weighted images. On CT the tumour was isodense in six cases and calcification was detected in four. The presence of both desmoplastic development and a tumour/vermis cleavage plane in a posterior cranial fossa tumour isodense on CT is highly suggestive of ependymoma.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1432-1920
    Keywords: Angioblastoma ; Fibromatosis ; Hamartoma ; Magnetic resonance imaging ; Spinal tumours ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report a child aged 2 years. presenting with delayed motor development. A thoracolumbar subcutaneous mass was noticed in the first months of life. MRI showed a low conus medullaris, confirmed the presence of the mass and detected a second solid lesion in the intradural space. Surgery confirmed that the two lesions were distinct, as on MRI. The histopathological features were in common with fibrous hamartoma of infancy, giant cell angioblastoma and the “diffuse type” of infantile fibromatosis. The presence of a low conus medullaris associated with a congenital clinical presentation suggested a disontogenetic aetiology.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1432-1920
    Keywords: Key words Medulloblastoma ; Childhood brain tumours ; Magnetic resonance imaging ; Computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Our purpose was to determine whether medulloblastoma (MB) shows specific neuroradiological features which may be employed in differential diagnosis from other common posterior cranial fossa tumours in childhood. Preoperative MRI was performed on 20 children with MB, and preoperative CT in 17 of them. All underwent surgery and histopathological diagnosis. There was a constant relationship between high density on CT and low signal on T1-weighted images. Signal behaviour on T2-weighted images and the degree of contrast enhancement were more variable. Most tumours arose in the midline, from the cerebellar vermis, involving the fourth ventricle, but hemisphere and extra-axial neoplasms were also seen. The combination of high density on CT and low signal on T1-weighted images is highly suggestive of MB and may assist preoperative differential diagnosis from other posterior cranial fossa tumours.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 1432-1920
    Keywords: Key words Angioblastoma ; Fibromatosis ; Hamartoma ; Magnetic resonance imaging ; Spinal tumours ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report a child aged 2 years presenting with delayed motor development. A thoracolumbar subcutaneous mass was noticed in the first months of life. MRI showed a low conus medullaris, confirmed the presence of the mass and detected a second solid lesion in the intradural space. Surgery confirmed that the two lesions were distinct, as on MRI. The histopathological features were in common with fibrous hamartoma of infancy, giant cell angioblastoma and the “diffuse type” of infantile fibromatosis. The presence of a low conus medullaris associated with a congenital clinical presentation suggested a disontogenetic aetiology.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...