Acoustic neuromas arise from the cells surrounding the eight cranial nerve. They are benign (non-cancerous) tumors. The generally grow very slowly. Prognosis depends on the size of the tumor. Its incidence is highest between 30 and 50 years of age.
Causes of Acoustic Neuroma
In general, the cause of these tumors is unknown. A small percentage of them occur in people with neurofibromatosis. This is a hereditary condition varcharacterized by widespread abnormalities of the nervous system, skin and bones.
Signs and Symptoms of Acoustic Neuroma
Partial or complete hearing loss in one ear is the most common symptom. Ringing or buzzing in the ear (tinnitus) can also occur. As the tumor enlarges, it can compress other structures, including the brainstem and other cranial nerves. Accordingly, symptoms such as facial paralysis, double vision and poor coordination can occur.
If the tumor grows large enough, it can obstruct the drainage of cerebrospinal fluid. This will produce hydrocephalus. Headaches, nausea and vomiting and lethargy can occur.
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