An anal fistula is a tunnel that develops from the inside of the anus to the skin outside. It usually starts near blocked or infected anal glands and forms an abscess (a pus-filled pocket). Pus and ...
A colovesical fistula is an abnormal connection that develops between the colon and the bladder. It can result from diverticulitis, Crohn’s disease, or another gastrointestinal condition. Read on to ...