While it usually grows slowly and does not spread to other parts of the body, in some cases it can become large enough that it compresses the nerves to cause balance and hearing disorders.

There are no known risk factors for this rare tumor, which typically affects people over 40. Diagnosis relies on medical history, hearing tests and MRI imaging.

Symptoms

• Hearing loss (usually gradual and only on one side)
• Ringing in the ear
• Balance problems
• Dizziness
• Facial numbness and weakness or paralysis