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Fig. 5. —59-year-old woman referred to our unit 30 days after laparoscopic cholecystectomy and removal of stones from common bile duct. Cholangiogram obtained through Ring catheter (William Cook Europe) shows residual calculus and intraabdominal catheter trajectory of 360° curve. This is one of our failures, for we could not rectify trajectory of catheter because it had become stabilized as a result of amount of time that had passed.