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pilonidal sinus

pilonidal sinus in Medicine

pilonidal sinus n.
A fistula or pit in the sacral region, communicating with the exterior and containing hair that may act as a foreign body and produce chronic inflammation. Also called pilonidal fistula.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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