Abstract:Objective To compare the efficacy and safety of endoscopic retrograde cholangiopancreatography (ERCP) in treatment of common bile duct stones complicated with peripapillary choledochoduodenal fistula (PCDF).Methods Clinical data of 259 patients with choledocholithiasis complicated with PCDF from January 2008 to December 2019 were analyzed retrospectively. According to the stone removal method, they were divided into the pappila group (n = 141) and the fistula group (n = 118). The success rate of one-time stone removal, the total success rate of stone removal, the rate of mechanical lithotripsy, the operation time, the use rate of intraoperative expansion or incision and the incidence of postoperative complications were compared between the two groups.Results During this period, 9 390 patients underwent ERCP for choledocholithiasis, and 259 cases (2.8%) of choledocholithiasis complicated with PCDF. The success rate of transfistula cholangiography was 100.0%, 145 cases of duodenal papillary bile duct catheterization for various reasons, the success rate was 97.2% (141/145). There were no significant differences between the two groups in one-time stone removal success rate [77.1% (91/118) vs 79.4% (112/141), P = 0.652], total stone removal success rate [86.4% (102/118) vs 87.9% (124/141), P = 0.718], mechanical lithotripsy rate [9.3% (11/118) vs 8.5% (12/141), P = 0.819] and operation time [(19.83 ± 12.24) min vs (18.52 ± 11.90) min, P = 0.500). The proportion of incision or expansion in the fistula group was significantly lower than that in the pappila group [44.9% (53/118) vs 88.7% (125/141), P < 0.05], the proportion of postoperative acute pancreatitis and the total complications rate in the fistula group were significantly lower than those in the pappila group [0.0% (0/118) vs 9.2% (13/141), P < 0.05; 5.1% (6/118) vs 22.0% (31/141), P < 0.05].Conclusion ERCP for choledocholithiasis combined with PCDF through the fistula can achieve the same effect as that through the original pappila, reduce the incidence of postoperative acute pancreatitis and make the operation simpler; Therefore, ERCP is preferred to take stones through fistula for patients with common bile duct stones complicated with PCDF.