A type of benign brain tumor that begins in the Schwann cells, which produce the myelin that protects the acoustic nerve - the nerve of hearing. The disease is MONDO_0001569 (acoustic neuroma). Also known as: acoustic neurilemmoma, acoustic neurilemoma, acoustic neurinoma, acoustic schwannoma, neurilemoma, acoustic, neurinoma of the acoustic nerve, neuroma, acoustic, vestibular neurilemmoma.