What are schwannomas?

Updated: Jan 30, 2020
  • Author: Ginard I Henry, MD; Chief Editor: Gregory Gary Caputy, MD, PhD, FICS  more...
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Answer

Answer

Schwannoma, or neurilemmoma, usually presents as a solitary, painless, flesh-colored lesion of variable size. The lesions are located subepidermally but exhibit protuberance in skin, depending on size and subcutaneous position. Occasionally, a schwannoma may elicit a Tinel sign (tapping of the nerve elicits a tingling, “pins and needle” sensation) if a peripheral nerve is significantly compressed. The pathogenesis of schwannomas is unclear.


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