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Anal fistula
- Surgery for Crohn's Disease (Crohn's & Colitis Foundation of America)... and form a connection or tunnel, called a fistula. Fistulas often occur between two parts of the intestine, between the intestine and another organ such as the bladder or vagina, or break through to the skin surface. Fistulas can also form around the anal area, which may cause drainage of mucus or ...