• Unknown.

• Proliferation of Schwann cells.

• Sporadic

• Generally disease of adults

• Associated with sensory nerves, especially the 8th (acoustic neuroma) in an intracranial location, around the spine with extension through the vertebral foramina, or associated with major nerve trunks

• Benign lesion treated by surgical resection.
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• Encapsulated neoplasms which can be divided from the intact nerve.

• Neoplasms are adjacent to nerve which may splay over it

• Firm, gray lesions that may have degenerative changes.

• Antoni A regions show lining up of delicate wavy nuclei in bands separated by eosinophilic cytoplasm

• Rows of nuclei are Verocay bodies

• Antoni B regions show less organization.

• S-100 reactive.

• Cotran RS, Kumar V, Robbins SL: Robbins Pathologic Basis of Disease. 5th ed. Philadelphia, W.B. Saunders, 1994, pp. 1352.

• Current literature from PubMed at National Library of Medicine