What is the prevalence of fistula-in-ano (anal fistula)?

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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The true prevalence of fistula-in-ano is unknown. The incidence of a fistula-in-ano developing from an anal abscess ranges from 26% to 38%. [5, 12] One study showed that the prevalence of fistula-in-ano is 8.6 cases per 100,000 population. In men, the prevalence is 12.3 cases per 100,000 population, and in women, it is 5.6 cases per 100,000 population. The male-to-female ratio is 1.8:1. The mean patient age is 38.3 years. [13]

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