Colo-cholecystic fistula: an unusual complication of colonic diverticular disease.

Colonic diverticular disease can lead to various complications. We describe a case of an 81-yr-old man who was found to have intrabiliary air on computed tomography of the abdomen. Endoscopic retrograde cholangiopancreatography and subsequent surgical exploration of the abdomen revealed an ascending colonic diverticulum penetrating into the gall bladder. Colocholecystic fistula is an unusual cause of intrabiliary air and, to our knowledge, this has not been reported in the literature.