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The cause of acoustic neuromas — tumors on the main balance nerves leading from your inner ear to your brain (eighth cranial nerve) — appears to be a malfunctioning gene on chromosome 22. Normally, this gene produces a protein that helps control the growth of Schwann cells covering the nerves. What makes this gene malfunction isn't clear.

Scientists do know the faulty gene is inherited in neurofibromatosis type 2, a rare disorder that usually involves the growth of tumors on balance nerves on both sides of your head (bilateral vestibular schwannomas).

Apr. 16, 2013

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