The following is an excerpt....
BASICS
Description
- Slow-growing benign tumor, most often arising from the vestibular division of 8th cranial nerve
- Originates from Schwann cells of the nerve sheath (“schwannoma”)
- Usually arises in the internal auditory canal near the cerebellopontine angle
- Often has extracanalicular portion into the cerebellopontine angle, but may also stay purely intracanalicular
- Most are unilateral; bilateral only seen in neurofibromatosis type II
Epidemiology
- 6–10% of all intracranial tumors
- 80–90% of cerebellopontine angle tumors
- 95% of cases are unilateral.
- Present most commonly in the 5th–6th decade
- Female predominance
- Bilateral acoustic neuroma occurring in neurofibromatosis II present before age 30
Incidence
- 1/100,000 per year
- Asymptomatic lesions may be more common.
Prevalence
3,000 diagnosed annually in the US ...
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