Entero-enteral or enterocutaneous fistula is an abnormal passage that leaks the contents of the stomach or the intestine (small or large bowel) to other organs, usually other parts of the intestine (entero-enteral) or the skin (enterocutaneous).
The majority of entero-enteral or enterocutaneous fistulas are the result of surgery. A significant minority result from trauma, especially penetrating traumas such as stab wounds or gunshot wounds. Inflammatory processes, such as infection or inflammatory bowel disease (Crohn's disease), may also cause fistulas.