PREOPERATIVE DIAGNOSIS:,  Cholelithiasis; possible choledocholithiasis.surgery, choledocholithiasis, cholangiogram, co2 insufflation, umbilicus, common bile duct, bile duct, laparoscopic cholecystectomy, cystic duct, intraoperative, laparoscopic, cholecystectomy, cholelithiasis, endotracheal, gallbladder, cystic, duct