Atypical presentation of cystic schwannoma of the sphenoid sinus: a nonsolitary mass with osseous, intracranial and cavernous sinus invasion.

摘要: Although nearly half of all schwannomas involve the head and neck region, nasal paranasal sinus presentations are quite rarely seen. Cystic schwannoma, characterized by cyst formation lined S-100 protein positive membrane-like structures is very uncommonly seen in sphenoid with only a single previously reported case. Here we report young patient cystic schwannoma sinuses having epicenter sinus. The tumor had caused extensive erosion skull base extended intracranially that radiologically mimicked as infected mucocele causing loss vision. This case denotes aggressive behavior such uncommon tumors.