schwannoma

1. See neurofibroma.
2. See neurilemoma.

A neoplasm originating from Schwann cells (of the myelin sheath). Most occur in the skin, but they are also found in nerve trunks and roots. The Schwann cell is also a component of neurofibromas. Called also neurilemmoma.

• cardiac s. — single or multiple round or nodular masses on the epicardial surface or within the myocardium.
• granular cell s. — see granular cell tumor.