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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Der Radiologe 38 (1998), S. 904-912 
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Hirnstammgliom ; CT ; MRT ; Klassifikation ; Prognose ; Key words Brain-stem glioma ; CT ; MRI ; Classification ; Prognosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Brain-stem gliomas occur mainly in childhood and are localized in the mesencephalon, pons and medulla oblongata. Diagnosis is a domain of MRI, requiring T2, T1 and KM. CT shows hemorrhage and calcification well. The criteria are the primary site, size, tumor growth, brain-stem enlargement, delineation, intralesional structure, exophytic components and enhancement. Secondary criteria are herniation, hydrocephalus and liquorgenic seeding. In CT glioma are hypodense, in MRI hyperintense in T2 and hypointense in T1. Enhancement is seen in 25–60% and does not allow differentiation of tumor vs nontumor or gradings. Factors influencing poor outcome are high grade, a short history, cranial nerve involvement, severe brain-stem enlargement, pontine site, diffuse growth and recurrency. The 5-year-survival rate is 30% (after radiation: focal tumors 85%, diffuse 20%). Most frequent are symptoms of brain pressure, cerebellum, cranial nerves and pyramidal tract. There is no agreement on whether biopsy is necessary or not. A diagnosis of tumor is highly suggestive if classical MRI findings fit the clinical history.
    Notes: Zusammenfassung Hirnstammgliome treten überwiegend im Kindesalter auf und sind im Mesenzephalon, Pons und der Medulla oblongata lokalisiert. Die Diagnostik ist eine Domäne der MRT und erfordert T2-, T1-Sequenzen und Kontrastmittel (KM). Die CT ist zum Nachweis von Blutungen und Verkalkungen prädestiniert. Beurteilungskriterien sind Primärsitz, Tumorgröße, Ausdehnung, Hirnstammverbreiterung, Tumorränder, Binnenstruktur, exophytische Anteile und KM-Aufnahme. Sekundäre Kriterien sind Einklemmung, Liquoraufstau und liquorgene Aussaat. Hirnstammgliome sind im CT hypodens, im MRT in T2 hyperintens, in T1 meistens hypointens. Schrankenstörungen lassen sich in 25–60% der Fälle nachweisen und erlauben keine Differenzierung von Tumor/Nichttumor oder verschiedenen Gradierungen. Diskussion: Prognostisch ungünstig sind hohe Gradierung, kurzer klinischer Verlauf, Hirnnervenbefall, ausgeprägte Hirnstammverbreiterung, pontine Lokalisation, diffuse Ausbreitung und Rezidiv. Die 5-Jahres-Überlebensrate beträgt 30%, nach Strahlentherapie bei fokalen Tumoren 85%, bei diffusen 20%. Die häufigsten Symptome sind Hirndruckzeichen, zerebelläre Ataxie, Hirnnervenbefall und Pyramidenbahnzeichen – in ca. 40% Tortikollis. Die Biopsie wird kontrovers diskutiert. Zumindest ist bei klassischem MRT-Befund und passender Klinik die Diagnose Tumor hochwahrscheinlich.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neuro-oncology 38 (1998), S. 111-120 
    ISSN: 1573-7373
    Keywords: neoplastic meningiosis ; MRI ; CT ; gadolinium ; enhancement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Since the introduction of CT and MRI as diagnostic aids, it has been possible to obtain direct images of neoplastic meningiosis. After more than ten years experience, the combination of MRI with the administration of a paramagnetic contrast medium is now accepted as the method of choice for the sensitive detection of meningeal diseases and for monitoring their treatment. The almost uniform character of leptomeningeal or pachymeningeal enhancement in the presence of infective, inflammatory, neoplastic, vascular or reactive changes is the reason for the restricted specificity of MRI, so that with the imaging process alone only very limited information about the etiology is available. Clinical data, laboratory findings, examination of the CSF and histopathological examination are therefore essential for interpreting the meningeal changes and making a differential diagnosis. Various pathophysiological processes can lead to a single meningeal enhancement visualizable with MRI: 1. a genuine disturbance of the blood-brain barrier is found in the presence of infection or inflammation, 2. leptomeningeal structures can be directly infiltrated by sheets or nodules of tumors, the blood vessels of which possess no intact blood-brain barrier, 3. physical or chemical irritants may produce of local inflammatory reaction with vascular proliferation and its corresponding enhancement, a 4. a pseudoenhancement may follow reactive dilatation of the vessels. In the present article the various appearances of neoplastic invasion of the meninges in MRI and their differential diagnosis will be described.
    Type of Medium: Electronic Resource
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