Anal fistula

Anorectal rectal fistula mainly invades the anal canal and rarely involves the rectum. Therefore, it is often called anal fistula. It is a granulomatous duct that communicates with the skin in the perineal area. The entire fistula wall consists of thickened fibrous tissue with a layer of granulation tissue inside, which will last forever. The incidence is second only to hemorrhoids, more common in young males, and may be related to the strong secretion of sebaceous glands, one of male sex hormone target organs.