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pilonidal sinus

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