Abstract: Objective This study was to conducted to evaluate one-stop magnetic resonance imaging (MRI) in typing and evaluating pancreaticobiliary duct anatomy in children with choledochal cysts (CC). Methods 136 children with CC were encountered in our hospital between June 2019 and June 2022, all underwent one-stop MRI, CT and intraoperative cholangiography, and the CC was evaluated based on Todani, Kurumi and Komi typing. Results Out of our children with CC, the Todani typing showed type Ⅰa in 93 cases(68.4%), type Ⅰb in 5 cases (3.7%), type Ⅰc in 5 cases (3.7%), type Ⅱ in 16 cases (11.8%), type Ⅲ in 3 cases (2.2%) and type Ⅳ in 14 cases (10.3%); the Kurumi typing demonstrated type C in 106 cases (77.4%), type L in 5 cases(3.7%), type R in 7 cases (5.1%), type A in 9 cases (6.6%) and type P in 9 cases (6.6%); the Komi typing showed type A in 47 cases (34.5%), type B in 60 cases (44.1%), type C in 16 cases (11.8%) and normal pancreaticobiliary duct confluence in 13 cases (9.5%); the one-stop MRI scan showed that the percentages of normal biliary ducts, biliary duct variation and pancreaticobiliary maljunction were 80.1%, 19.8% and 83.8%, which very similar to 80.1%, 19.8% and 86.8% by cholangiography, significantly different as compared to 94.1%, 5.8% and 69.1%(P<0.05) revealed by CT scan. Conclusion One-stop MRI scan is more sensitive and accurate in typing CC and evaluating pancreaticobiliary duct anatomy, and we recommend it as a priority choice of check-up for children with CC.

Key words: Choledochal cysts, One-stop MRI, Cholangiography, Choledochal cyst typing, Pancreaticobiliary ducts, Children