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  • 1
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Megadolichobasilaris ; Hörsturz ; Magnetresonanzangiographie ; 3D-Computertomographie ; Key words Sudden deafness ; Megadolichobasilar anomaly ; Magnetic resonance angiography ; Three-dimensional computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The megadolichobasilar artery is a rare vascular anomaly that can cause a variety of clinical symptoms but is usually asymptomatic. Not much attention has been given as yet to a possible sensorineural hearing loss caused by a megadolichobasilar anomaly. Vascular compression of the vestibulocochlear nerve must be assumed to be the pathogenic factor. The megadolichobasilar anomaly represents a rare entity in the differential diagnosis of sudden idiopathic sensorineural hearing loss. More common causes are acoustic neuromas, monosymptomatic Menière’s disease and rupture of the round window membrane. We present the case of a 71-year-old white male in whom magnetic resonance angiography combined with contrast-enhanced computed tomography in three-dimensional reconstruction eventually led to the diagnosis of megadolichobasilar anomaly. The combination of both imaging techniques may be required for the effective diagnosis of similar vascular anomalies.
    Notes: Zusammenfassung Die Megadolichobasilaris (Aufweitung, Elongation und abnorme Schlängelung der A. basilaris) ist eine seltene anatomische Variante. Die klinische Symptomatik kann vielfältig sein, asymptomatische Verläufe dominieren jedoch. Eine bislang wenig beachtete Folge der Megadolichobasilaris ist der akute Abfall des Innenohrhörvermögens. Ursächlich muß eine vaskuläre Kompression des N. vestibulocochlearis angenommen werden. Hier stellt die Megadolichobasilaris eine seltene Differentialdiagnose zum Hörsturz, dem Akustikusneurinom, der monosymptomatischen Verlaufsform des M. Menière sowie der Ruptur der Rundfenstermembran dar. Wir stellen eine entsprechende Kasuistik vor, bei der zur bildgebenden Diagnostik eine Magnetresonanzangiographie sowie eine Kontrastmittelcomputertomogrammuntersuchung mit dreidimensionaler (3D-)Rekonstruktion durchgeführt wurden. Die Kombination beider Verfahren hat sich in der Diagnostik vaskulärer Anomalien wie der Megadolichobasilaris bewährt.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 38 (1996), S. 663-668 
    ISSN: 1432-1920
    Keywords: Key words Temporal bone ; Spiral (helical) computed tomography ; Three-dimensional reconstruction ; Otological surgery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We studied the usefulness of spiral CT for preoperative information on the individual anatomy of the temporal bone in a computed three-dimensional (3D) display. In 87 patients with various otological diseases, 3D reconstructions were performed based on spiral high-resolution CT (HR-CT) by volume-rendering on an independent workstation. The positions of the ossicles, facial nerve, labyrinth and vestibular aqueduct relative to reference points were comprehensively demonstrated by thresholding or interactive segmentation. Spiral CT enables 3D display of otosurgical operation sites in a shorter scan time than conventional CT. 3D reconstructions improve the surgeon's understanding of individual anatomy and thus help in surgical planning. This is particularly important for surgery of temporal bone tumours, middle ear deformities, cochlear implants and saccotomy.
    Type of Medium: Electronic Resource
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