Anomalous pancreaticobiliary ductal union (APBDU) is an uncommon anomaly, defined as the junction between the common bile duct and the pancreatic duct outside the duodenal wall and beyond the influence of the sphincter of Oddi. This anomaly, which has been recognized frequently since the introduction of ERCP, is believed to be associated with biliary tract lesions such as congenital biliary dilatation, biliary tract carcinoma, and pancreatic lesions such as pancreatitis new paragraph. A 28-year-old male was admitted due to sudden abdominal pain and vomiting. An ERCP revealed a peculiar type of APBDU; the duct of Wirsung and CBD fused and formed a long common channel before entering the major papilla, and the duct of Santorini connected to the duct of Wirsung is patent. So, when contrast dye was inserted into the minor papilla, both the CBD and the duct of Wirsung were made visible. This case of the peculiar type of APBDU which showed characteristic ERCP findings are herein reported. (Korean J Gastrointest Endosc 2000;20:145-148)