What are acoustic neuroma brain tumors?

An acoustic neuroma is a benign, or non-cancerous, brain tumor that develops on the eighth cranial nerve. Also known as the vestibulocochlear nerve, it connects the inner ear with the brain and has two different parts.
These tumors may grow on one or both sides of the brain. They do not actually invade the brain, but they can push on it as they grow. Acoustic neuromas account for about 7 percent of all brain tumors.
Larger tumors can press on cranial nerves that control muscle movements of the face.
The first symptom is usually a gradual loss of hearing in one ear, often accompanied by ringing in the ear.

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