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horseshoe fistula

(hôrsshōō′, hôrsh-)
n.
  1. An anal fistula partially encircling the anus and opening at both ends on the cutaneous surface.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.