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Perianal fistula

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

An anal fistula is an abnormal communication between two epithelial surfaces - the perianal skin and the anal or rectal lumen (1).

  • this abnormal tract is lined with granulation tissue
  • it may harbour chronic infection resulting in continuous or intermittent discharge through the external opening on to the skin
  • soiling of underwear and skin irritation may be seen in severe cases due to faecal material passing through the tract (1)

In England, incidence of anal fistula is 18.4 per100,000/year. More common in men (twicw as likely to be affected) with peak around 40 years of age (1).

Fistulae may be complex, with several openings onto the perianal skin (2).

Reference:

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