Acoustic neuroma - A rare, noncancerous tumour arising from supporting cells that surround the 8th cranial nerve (see acoustic nerve), usually within the internal auditory meatus (the canal in the skull through which the nerve passes from the inner ear to the brain).
Usually, the cause of an acoustic neuroma is unknown. However, tumours that affect the nerves on both sides of the head simultaneously may be part of a condition known as neurofibromatosis. Acoustic neuroma can cause deafness, tinnitus, loss of balance, and pain in the face and the affected ear.
Diagnosis is made by hearing tests followed by X-rays, CT scanning, or MRI. Surgery may be needed, but treatment with radiotherapy to shrink the tumour is also effective.
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