Trigeminal neurilemmoma presenting as a sphenoid sinus mass.

Trigeminal neurilemmomas have been known to invade the posterior fossa. Infratemporal fossa, encroach upon the lateral wall of the sphenoid sinus and extend along the three divisions of the trigeminal nerve. Herein described, is a patient with a trigeminal neurilemmoma that extended into the sphenoid sinus, necessitating transphenoidal excision.