Acoustic Neurinoma
tumor, usually benign, which may develop on the hearing and balance nerves and can cause gradual hearing loss, tinnitus, and/or dizziness. (sometimes called vestibular schwannoma). Also see Neurofibromatosis Type 2. | ||||
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Acoustic Neurinoma Definition from Encyclopedia Dictionaries & Glossaries
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Acoustic neuroma
An acoustic neuroma, also called a vestibular schwannoma, is a benign primary intracranial tumor of the myelin-forming cells of the vestibulocochlear nerve (CN VIII). The term "acoustic neuroma" is a double misnomer, as the tumor never arises from the acoustic (or cochlear) division of the vestibulocochlear nerve and is not of neuron origin. The correct medical term is vestibular schwannoma, because it involves the vestibular portion of the 8th cranial nerve and it arises from Schwann cells, which are responsible for the myelin sheath in the peripheral nervous system. Approximately 3,000 cases are diagnosed each year in the United States with a prevalence of about 1 in 100,000 worldwide. Incidence peaks in the fifth and sixth decades and both sexes are affected equally.
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