An unusual case of a retained stone following laparoscopic cholecystectomy

A patient with gallstone pancreatitis was managed by endoscopic sphincterotomy followed by a laparoscopic cholecystectomy. At the time of surgery, an intraoperative cholangiogram disclosed the presence of a residual calculus, which was erroneously thought to be in the common bile duct. A repeat ERCP showed that the stone was, in fact, in a long cystic duct stump which was fortunately accessible to endoscopic extraction.