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A fistula is a hollow tube of tissue connecting two different intestinal segments, two different organs, or an organ to the outside of the body. They form as a consequence of intestinal perforation from Crohn’s disease. 
Examples of fistulas include: 
  • Perianal (from the rectum to outside the anus) 
  • Ileo-cutaneous (from the ileum to the skin) 
  • Ileo-colonic (from the ileum to colon) 
  • Recto-vaginal (from the rectum into the vagina) 
  • Colo-vesical (from the colon to the bladder)