[Colonic gallstone ileus: a rare cause of colonic obstruction].

Bile ileus with migration of the gallstone into the colon through cholecystocolonic fistula is rare. The diagnosis is difficult and often late. We here report the case of a 89-year old patient with a history of sigmoid diverticular disease presenting with colonic obstruction associated with bile ileus caused by migration of a large gallstone through cholecystocolonic fistula. Abdominal CT scan allowed the diagnosis. The patient underwent surgical extraction of the gallstone with sigmoidotomy followed by sigmoidostomy with subsequent recovery of the digestive continuity. The cholecystocolonic fistula wasn't identified.