How is a transsphincteric fistula-in-ano (anal fistula) characterized?

Updated: Mar 27, 2020
  • Author: Juan L Poggio, MD, MS, FACS, FASCRS; Chief Editor: John Geibel, MD, MSc, DSc, AGAF  more...
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A transsphincteric fistula-in-ano is characterized as follows:

  • In its usual variety, this fistula results from an ischiorectal fossa abscess
  • Common course - It tracks from the internal opening at the dentate line via the internal and external anal sphincters into the ischiorectal fossa and then terminates in the perianal skin or perineum
  • Incidence - 25% of all anal fistulas
  • Other possible tracts - High tract with perineal opening; high blind tract

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