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A 34 year old woman presented with falling to the right side accompanied by vertigo and numbness on the right face.
(Left) T2-weighted axial MRI; (Right) T1-weighted MRI with gadolinium. Note the nodular mass in the region of the right cerebellar pontine angle. It enhances with gadolinium. On the T2 scan, note the associated cyst both the left and right on the mass. On biopsy, this lesion was a schwannoma, a histologically benign tumor. Schwannomas are characteristically seen arising from cranial nerve VIII, the vestibulo-cochlear nerve, where they are known as acoustic neuromas.
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