Schwannomas develop within the peripheral nervous system, which includes the cranial nerves and nerve roots, though their development in the brain or spinal cord is rare. One of the most common areas for a schwannoma is on the nerve that connects the inner ear to the brain; this is a vestibular schwannoma. Rare, cancerous schwannomas typically develop in the brachial plexus nerve in the arm, the sciatic nerve in the legs, or the sacral plexus in the lower back.
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