Vestibular Schwannoma

A vestibular schwannoma, often called an acoustic neuroma, is a benign primary intracranial tumor of the myelin-forming cells of the vestibulocochlear nerve (CN VIII). The term "vestibular schwannoma" involves the vestibular portion of the 8th cranial nerve and 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. It comprises 5–10% of all intracranial neoplasms in adults. Incidence peaks in the fifth and sixth decades and both sexes are affected equally.

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Vestibular Schwannoma - Treatment - Radiation Therapy
... It is not clear what percentage of tumors are controlled by this method for long periods ... In earlier times when higher radiation doses were used, the failure rate was about 12% (which then required surgery) ...