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This is a review of common bile duct dilatation and duodenal diverticulosis. Special emphasis is given to the possible role of the minor papilla in the diverticulum in the formation of the dilatation. Introduction Since its first report by Babbit (1969), anomalous pancreaticobiliary ductal union has been discussed as playing a possible etiological role in common bile duct dilatation (Morishita, Fujii et al., 1978; Morishita, Asakura et al., 1980). Bile duct dilatation is of particular importance in that bile duct carcinoma has been reported to develop from the dilated segment-particularly in young patients (Komi, Kunitomo et al., 1984). However, it has begun to seem unlikely that an anomalous union is a cause of the dilatation. We have previously reported two cases of common bile duct dilatation in which ERCP (endoscopic retrograde cholangiopancreatography) disclosed the minor papilla in the Correspondence to: Tetsuo Morishita, Department of Internal Medicine, Shizuoka Red Cross Hospital, 8-2 Ohtemachi, Shizuoka-shi, Shizuoka 420-0853, Japan

THE MINOR PAPILLA IN THE DUODENAL DIVERTICULUM: ITS POSSIBLE ETIOLOGICAL ROLE IN THE FORMATION OF COMMON BILE DUCT DILATATION