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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 380 (1995), S. 203-206 
    ISSN: 1435-2451
    Keywords: Magnetic resonance imaging ; Cervical spine ; Titanium implant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Vorstellung von 10 Patienten, von denen sich 8 Rückenmarkschädigungen und 2 radikuläre Beeinträchtigungen im Rahmen von Dislokationsverletzungen der HWS zuzogen und die nach Stabilisierungsoperationen im Zeitraum von 2 Tagen bis 8 Monaten mittels MRT abgekldrt werden, verfolgt das Ziel, die Einsatz-und Aussagembglichkeiten dieser nicht-invasiven Methode darzustellen. Bei 2 Patienten mit schwerem Schädelhirntrauma konnte die Ursache für die Querschnittsläsion eindeutig einer Rückenmarkschädigung zugeordnet werden. Ebenso korrelierten schwere Binnenschäden des Rückenmarks, wie intramyeläre Hämatome oder Transsektionen, mit kompletten Querschnittsläsionen. Alleinige Rückenmarködeme traten mit einer inkompletten Querschnittsläsion auf. Die Beurteilung des Ruckenmarks nach postoperativer neurologischer Verschlechterung ermöglicht den Ausschluß einer Rückenmarkkompression als Ursache. Die MRT eignet sich auch zur lebenslangen Beurteilung von Rückenmark- und HWS-Veränderungen. Somit kann das Rückenmark mit der postoperativen MRT in Problemfällen und zur Prognoseerstellung herangezogen werden.
    Notes: Abstract We present the cases of ten patients who underwent postoperative magnetic resonance assessment after dislocation injuries of the cervical spine and treatment with anterior interbody fusion and titanium implants. Eight patients had spinal cord injuries and two had nerve root disorders. In two patients who had intracranial haematomas and dislocation fractures of the cervical spine, MRI proved useful for identification of parenchymal spinal cord injuries as the reason for transverse lesions. Severe MR findings of the parenchymal spinal cord injuries (haematoma or transection) correlated with complete transverse lesions (4 patients) and oedema of the spinal cord, with incomplete transverse lesions (3 patients). MR enables us to examine the spinal cord after operations to ensure that correct spinal cord decompression has been achieved (3 patients). MRI is useful for detecting disc protrusion or chronic spinal stenosis in patients with titanium implants. All in all, MRI is an important modality in the evaluation of the posttraumatic cervical spine.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0878
    Keywords: Brain vessels ; Perivascular space ; Connective tissue ; Blood-brain-barrier ; Lepidosteus (Ganoidei) ; Teleosts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Blood vessels surrounded by unusually wide perivascular spaces rich in connective tissue were observed in the brain of Lepidosteus (Ganoidei). Connective-tissue sheaths measuring up to 13 μm in width enclose arterioles and venules (40–70 μm in diameter), and even capillaries may be encompassed by a cuff formed by collagen fibers. Blood vessels with wide perivascular spaces are mainly located in the subependymal layer of the lateral ventricles, near the mesencephalic aqueduct and in the folded basal lining of the fourth ventricle. At the light-microscopic level these vessels do not show any distinct contact with nervous elements (axons). Some other brain regions of Lepidosteus, e.g. mesencephalic tectum, are supplied by a conventional type of capillaries, free of connective-tissue linings. For comparative reasons, brains of several selachian and teleostean species were examined with comparable histological methods. Distinct perivascular spaces were found in the pike, in the trout and in the eel. They are considerably richer in connective tissue than the occasionally observed narrow perivascular spaces in the shark. The significance of the abundant perivascular connective tissue in the brain of Lepidosteus is open to discussion; structural and functional problems of the brain-blood-barrier have been reviewed in this context. The brain of Lepidosteus appears to be a very suitable model for studies of blood supply, vascular ultrastructure and blood-brain-barrier functions.
    Type of Medium: Electronic Resource
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