Recurrence of acoustic neurilemoma as a malignant spindle-cell neoplasm. Case report.

McLean, C A; Laidlaw, J D; Brownbill, D S; Gonzales, M F · J Neurosurg · 1990

case_report · Level V

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Abstract

A 75-year-old man presented with a right cerebellopontine angle tumor 11 months after complete macroscopic resection of a right acoustic neurilemoma. Histological examination of the recurrent tumor showed a malignant spindle-cell neoplasm with positive staining for S-100 protein. The patient had no stigmata of von Recklinghausen's disease. It is proposed that this recurrence represents progression from a benign to a malignant acoustic nerve-sheath tumor, an event that is extremely rare outside the clinicopathological context of neurofibromatosis.

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