According to the Cleveland Clinic, an anal fistula often develops as a complication of an anal abscess, which is an infected wound that drains pus from the anus. The abscess can form a tunnel, or ...

A fistula is an abnormal hole in the bowel or the bladder. A recto-urethral fistula is a hole between the urethra (urinary channel) and the rectum. This hole leads to leakage of urine into the rectum ...