Fig. 2

Case 1. The cystic duct branched off the aberrant anterior hepatic duct. a Preoperative drip-infusion cholangiography CT. The white arrow indicates the cystic duct branched off the aberrant right hepatic duct. b The imaginary diagonal line (D-line) of the segment IV of the liver (yellow arrow) was first identified. c The serosa of the gallbladder was incised, and the subserosal layer of the gallbladder wall was dissected along the D-line. d Subsequently, the critical view of safety was achieved