This condition may complicate anorectal abscesses

  • Crohn’s disease
  • Ulcerative colitis
  • Tuberculosis
  • Colloid carcinoma of the rectum
  • LGV
  • HIV infections.

The types of fistula in ano

  • Subcutaneous (anus to skin)
  • Submucous
  • low anal (open below the anorectal ring)
  • High anal
  • Pelvirectal.

Clinical Features

  • There is persistent seropurulent discharge
  • periodic pain and pouting openings in the neighbourhood of the anal verge.

Appropriate examination involves palpating the anal internal opening for a nodule on digital examination; confirmation is made at proctoscopy.


  • Determine the primary pathology.
  • Deal with the primary pathology as well as the fistula.