Background Originate from vestibular branch of acoustic nerve Histologic feature schwannoma neuroma, neurolemmoma Predilection :30-50 Unilateral: majority Bilateral: Type II acoustic neuromaBackground ◼ Originate from vestibular branch of aucoustic nerve ◼ Histologic feature: schwanoma, neuroma, neurolemmoma ◼ Predilection: 30-50y ◼ Unilateral: majority ◼ Bilateral: Type II acoustic neuroma