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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 37 (1995), S. 104-108 
    ISSN: 1432-1920
    Keywords: Brain neoplasm diagnosis ; Magnetic resonance imaging ; Medulloblastoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Medulloblastomas are generally associated with childhood, but 14–30% occur in adults, accounting for 1% of adult central nervous system tumors. While approximately one third of adult medulloblastomas present as vermian tumors similar to those seen in childhood, the majority differ substantially from the childhood variety. In this series of 13 patients, 5 had lateral, seemingly extra-axial masses in the cerebellopontine angle or at the tentorium, simulating meningiomas or acoustic neuromas, but angiographic hypovascularity in 2 of the latter suggested a diagnosis other than meningioma. Of 4 paramedian tumors, 3 diffusely infiltrated the cerebellar white matter, showed little or no gadolinium enhancement and were not associated with hydrocephalus. Hydrocephalus was present in less than half of our patients; in childhood the reported incidence is 85–100%. A possible association with pregancy was noted.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 37 (1995), S. 104-108 
    ISSN: 1432-1920
    Keywords: Key words Brain neoplasm ; diagnosis ; Magnetic resonance imaging ; Medulloblastoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Medulloblastomas are generally associated with childhood, but 14–30 % occur in adults, accounting for 1 % of adult central nervous system tumors. While approximately one third of adult medulloblastomas present as vermian tumors similar to those seen in childhood, the majority differ substantially from the childhood variety. In this series of 13 patients, 5 had lateral, seemingly extra-axial masses in the cerebellopontine angle or at the tentorium, simulating meningiomas or acoustic neuromas, but angiographic hypovascularity in 2 of the latter suggested a diagnosis other than meningioma. Of 4 paramedian tumors, 3 diffusely infiltrated the cerebellar white matter, showed little or no gadolinium enhancement and were not associated with hydrocephalus. Hydrocephalus was present in less than half of our patients; in childhood the reported incidence is 85–100 %. A possible association with pregnancy was noted.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Angiographie ; Koronare Bypässe ; Myokardszintigraphie ; Echokardiographie ; Elektronenstrahl-Tomographie ; Spiral-Computertomographie ; Magnetresonanztomographie ; Key words Angiography ; Coronary artery bypass grafts ; Myocardial scintigraphy ; Echocardiography ; Electron beam tomography ; Spiral computed tomography ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Purpose: Electron beam tomography (EBT) permits acquisition of images with high spatial and temporal resolution. The value of EBT and other imaging modalities for the depiction of patent coronary artery bypass grafts (ACVB, IMA) are compared to coronary angiography and an overview of current results is given. Material and methods: Graft patency can be evaluated with indirect methods stress, such as echocardiography, radionuclide ventriculography, myocardial scintigraphy, positron-emission tomography (PET) and direct imaging modalities, such as Doppler/2D echocardiography, EBT, spiral computed tomography (SCT) and magnetic resonance angiography (MRA). Results: With indirect methods graft patency can be evaluated with sensitivity of 64–100% and specificity of 73–100%. EBT and SCT are equivalent in sensitivity (=94%) in the assessment of open venous grafts and specificity is up to 100%, but EBT is superior in the diagnosis of patent IMA grafts (sensitivity 100% vs 89%). Visualization of high-grade venous bypass stenosis seems possible with EBT. MRA with gradient echo technique is highly accurate in the assessment of patent venous grafts (sensitivity 77–93%) but has limited value in the evaluation of IMAs (sensitivity=53%). Promising are ultrafast 3D-MRA methods which permit high accuracy (sensitivity=94–96%) in assessing venous and arterial grafts. Discussion: Indirect imaging methods cannot differentiate between an occluded bypass, progression of coronary artery disease and myocardial infarction. EBT and SCT are equivalent in the diagnosis of open and occluded venous grafts, but EBT is superior in the assessment of patent IMA grafts. Visualization of high-grade venous bypass stenosis seems possible with EBT. MRA techniques, especially ultrafast 3D-MR methods, are highyly accurate in the assessment of patent venous and arterial grafts but are still limited to scientific research.
    Notes: Zusammenfassung Zielsetzung: Die Elektronenstrahl-Tomographie (EBT) erlaubt es, Einzelschichtbilder mit hoher räumlicher und zeitlicher Auflösung zu erzeugen. Der Stellenwert der EBT in der Diagnostik venöser und arterieller Bypässe soll anderen bildgebenden Verfahren gegenübergestellt werden. Material und Methoden: Die Beurteilung der Durchgängigkeit von Bypässen erfolgt mit indirekten und direkten Methoden. Indirekte Methoden umfassen die Streßechokardiographie sowie nuklearmedizinische Techniken wie die Radionuklidventrikulographie, Myokardszintigraphie und Positronen- Emissions-Tomographie (PET). Zu den direkten Verfahren zählen die Doppler-/2D-Echokardiographie, die Spiral-Computertomographie (SCT), Magnetresonanz-Angiographie (MRA) und die EBT. Ergebnisse: Mit nuklearmedizinischen Methoden gelingt die Beurteilung der Bypassdurchgängigkeit mit einer Sensitivität von 64%–100% bei einer Spezifität von 73%– 100%. Bei der Echokardiographie liegt die Sensitivität bei 83%–93%. EBT und Spiral-CT weisen vergleichbare Sensitivitäten (bis 94%) in der Beurteilung venöser Bypässe auf, die Spezifität wird mit bis zu 100% angegeben. In der Diagnostik arterieller Bypässe zeigt die EBT dagegen eindeutige Vorteile (Sensitivität bis 100%) gegenüber der SCT (Sensitivität bis 89%). Die morphologische Beurteilung hochgradiger venöser Bypass-Stenosen scheint nur mit der EBT möglich zu sein. Mit Gradienten-Echo-Techniken der MRA können angiographisch offene venöse Bypässe mit einer Sensitivität von 77%–93% als durchgängig bewertet werden, für die Diagnostik arterieller Grafts sind sie nicht geeignet (Sensitivität=53%). Vielversprechend sind moderne kontrastverstärkte 3D-MRA Methoden, die auch eine genaue Beurteilung von arteriellen Bypässen gestatten (Sensitivität=96%). Ob eine morphologische Beurteilung von Bypass-Stenosen mit Navigator-Echo-Technik möglich ist, muß noch untersucht werden. Zusammenfassung: Mit indirekten bildgebenden Verfahren ist eine Differenzierung zwischen Bypassverschluß, Progression der koronaren Herzerkrankung oder stattgehabten Myokardinfarkt nicht möglich. EBT und Spiral-CT sind gleichwertig in der Beurteilung der Durchgängigkeit venöser Bypässe. Die EBT besitzt Vorteile in der Diagnostik arterieller Bypässe und der morphologischen Beurteilung hochgradiger venöser Bypass-Stenosen. Die MRA, vor allem ultraschnelle kontrastverstärkte 3D-Methoden, weisen eine hohe diagnostische Aussagekraft in der Beurteilung der Durchgängigkeit venöser und arterieller Grafts auf, ihr Einsatz bleibt aber vorerst wissenschaftlichen Fragestellungen vorbehalten.
    Type of Medium: Electronic Resource
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