Double common bile duct: report of a case.

We report a case of double common bile duct. A 51-year-old woman was examined for abdominal pain. Ultrasound revealed a stone of approximately 7 mm in the gallbladder, and abdominal computed tomography revealed air in the intrahepatic bile duct and gallbladder. The endoscopic retrograde cholangiography showed that the contrast medium flowed into the duodenal bulbus from the gallbladder. The diagnosis was inflammatory cholecystoduodenal fistula, and a cholecystectomy was performed. There were no inflammatory changes surrounding the gallbladder. The resected specimen showed that the fistula was covered by a mucous membrane with Brunner's glands. The muscle layer of the fistula was continuous to the duodenum from the gallbladder, and no new connective tissue or inflammatory adhesion between the muscles could be seen. A double common bile duct was diagnosed in this patient. The postoperative course was uneventful.