In the case of most acoustic neuromas, the cause has escaped medical understanding. However, in roughly 8 out of 100 acoustic neuromas they are caused by a rare genetic disorder that affects about 1 out of 25,000 people. This disorder is known as neurofibromatosis type 2 (NF2). In these rare cases, those carrying the gene develop tumors on each side of the head. These tumors for some also grow on the spinal cord and membranes that surround the brain.
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