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  • 1
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Sinus- und Venenthrombose ; Computertomographie ; Spiral-CT ; Bildnachverarbeitung ; Key words Dural sinus thrombosis ; Computed tomography ; Helical CT ; Image processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Dural sinus thrombosis is not uncommon. Due to the nonspecific symptomatology, as well as the manifold etiology, clinical diagnosis may be difficult. In these cases imaging procedures are frequently crucial in deciding how to proceed and how to treat. The aim of our study was to evaluate the diagnostic utility of helical CT in the detection of dural sinus thrombosis. In 20 patients with clinically suspected thrombosis CT angiography was performed. In 6 patients dural sinus thrombosis was diagnosed. In order to acquire also arterial vessels, a short delay of about 22 s after the onset of the application of contrast medium was selected. By this method we found an occlusion of the MCA in two patients with clinically suspected sinus thrombosis. In all patients the transverse slices and the multiplanar reconstructions showed filling defects or an “empty delta” sign. With irregular outlines the thrombus could be depicted over the complete course of the sinus. The MIP reconstructions were particularly helpful in the evaluation of the vessel anatomy and the pathological collateral venous drainage. In three patients MR angiograms were available for comparison. The smaller veins, such as the v. vermis inferior, were less clearly depicted than in CT angiography. CT angiography is a fast and reliable method to exclude or verify a sinus thrombosis. It can be performed immediately after non-enhanced CT. According to our present experience CT angiography is sufficient for the diagnosis of a sinus thrombosis.
    Notes: Zusammenfassung In der Arbeit wird der Wert der CT-Angiographie zum Nachweis oder Ausschluß einer zerebralen Sinus- und Venenthrombose (SVT) dargestellt. Bei 20 Patienten mit dem klinischen Verdacht auf eine SVT wurde eine CT-Angiographie in Spiraltechnik durchgeführt. Bei 6 Patienten bestätigte diese die Verdachtsdiagnose, bei 16 konnte eine Thrombose ausgeschlossen werden. Bei allen Patienten mit nachgewiesener SVT zeigten die axialen Schnitte und die multiplanaren Rekonstruktionen Füllungsdefekte oder ein „Empty-delta-Zeichen“. Durch angepaßte spezielle Schnittführungen ließen sich die Thromben im gesamten Verlauf darstellen. Die MIP-Rekonstruktionen waren besonders für die anatomische Zuordnung von Gefäßen und für die Beurteilung von Kollateralvenen geeignet. Magnetresonanzangiographien bei 3 Patienten ließen kleinere Venen, wie die V. vermis inferior, weniger deutlich zur Darstellung kommen als die CT-Angiographie. Die CT-Angiographie erweist sich als eine rasch durchführbare und zuverlässige Methode zum Ausschluß oder Nachweis von Thrombosen der Hirnvenen oder des duralen Sinus. Sie kann unmittelbar an die native Standard-CT-Untersuchung angeschlossen werden, so daß die Dauer der Diagnostik verkürzt wird. Nach unserer bisherigen Erfahrung ist die CT-Angiographie in der Diagnostik von zerebralen venösen Thromosen so sicher, daß auf eine DSA verzichtet werden kann.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1084
    Keywords: Venous angioma ; Developmental venous anomaly ; Magneticresonance ; Cavernoma ; Cerebral veins ; Cryptic vascular malformations ; Angiographically occult vascular malformations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study reviews the neuroradiological findings of 43 patients with a developmental venous anomaly In in order to the clinical significance of this entity. All patients underwent unenhanced and contrast-enhanced computer tomography and magnetic resonance tomography, as well as selective angiography, and were followed for at least 2 years In 40% (17 of 43) of patients a cryptic vascular malformation found In the proximity to the developmentmental venous anomaly. Neurolo gical symptoms were present in 8 of 17 patients (47%) in this group. Patients with an isolated developmental venous anomaly had symptoms in 19% (5 of 26), but none of them had experienced a hemorrhage. Magnetic resonance was the most sensitive method for the diagnose of both types of lesions and alterations of the adjacent parenchyma. These results further support that developmental venous anomalies represent a clinically benign entity. However, patient, with an sociation of a developmental venous anomaly and a cryptic vascular malformation are at risk for hemorage from their angiographically occult vascular malformation. Magnetic resonance proved to be the imaging modality of choice for both entities and is appropriate for diagnosis and follow-up.
    Type of Medium: Electronic Resource
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