Fig. 4From: The segment IV approach: a useful method for achieving the critical view of safety during laparoscopic cholecystectomy in patients with anomalous bile ducta Preoperative drip infusion cholangiography CT image. The white arrow indicates the cystic duct branching off the left hepatic duct. b The imaginary diagonal line (D-line) of the segment IV of the liver (yellow arrow) was identified. c The dissection of the cystic structure proceeded along the D-line. d The critical view of safety was achievedBack to article page