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Tentorial schwannoma: a case report

Departments of Radiology and ² Neurosurgery, Osaka City University Medical School, 1-5-7 Asahimachi Abeno-ku Osaka 545 8585 Japan

View larger version (171K): [in a new window]   Figure 1. Axial contrast-enhanced CT scan at the level of the Pons reveals a heterogeneously enhanced mass approximately 20 mm in diameter at the right ambient cistern.

View larger version (186K): [in a new window]   Figure 2. Axial T1 weighted MRI at the level of the Pons. The mass is isointense to hypointense to brain on T1 weighted image (a). On T2 weighted image mixed signal intensity, composed of an isointense solid portion and a hyperintense cystic portion compared with brain was noted (b). The lesion enhances homogeneously after intravenous administration of contrast media (c). The midbrain is displaced medially and deformed. Wedge-shaped dural enhancement (arrow) which tapers backward is seen on the contrast-enhanced T1 weighted sagittal image (d).

View larger version (56K): [in a new window]   Figure 3. Schematic illustration of the cerebellar tentorial schwannoma (axial plane). The mass was located between the two leaves of the cerebellar tentorium, compressing and displacing the right trochlear nerve and midbrain.

View larger version (128K): [in a new window]   Figure 4. Photomicrograph of the surgical specimen, H&E, original magnification x 200. Photomicrograph of the surgical specimen shows long bipolar spindle cells with sporadic pallisading (a) and cells containing eosinophilic matrix (b), consistent with schwannoma.