The data of 166 patients that underwent laparoscopic cholecystectomy between November 1989 and December 1997 are given. In all cases intraoperative ERC and extraction of bile duct stones within the laparoscopic surgery were performed. The results show that by intraoperative simultaneous ERC bile duct stones can be removed with a success rate of 98.8% and a mortality rate of 0%. Intraoperative ERC is a secure and economic kind of treatment, especially the patient profits from this minimal invasive procedure.