Fig. 1

Characteristics of patients with postoperative choledocholithiasis. Over 30 years, 457 patients had choledochal cyst excision and followed up at our institution. In 21 patients (including two who had surgery at other centers), intrahepatic bile duct stones were identified. Four patients developed stones due to HJ stricture, but in 17 (81%) patients, the stones were associated with Todani type IVa, which involves IHD dilation. One-half of the patients with stones in RIPD/CCD in the intrapancreatic portion had confirmed pancreas divisum, classified as Komi type IIIC. *HJ, hepaticojejunostomy; IHD, intrahepatic bile duct; RIPD, remnant intrapancreatic common bile duct; CCD, common channel duct.