Fig. 4

a The intraoperative findings included an RSLT with a left-sided gallbladder. b The resection line was carefully decided by identifying the portal vein branch of the lateral inferior section (P3) and left paramedian section (P4) using intraoperative ultrasonography. The falciform ligament is indicated by an arrow. LHV, left hepatic vein. c The resection line was carefully decided by identifying the portal vein branch of the lateral superior section (P2).d IOUS was repeatedly used to ensure the resection of the lateral inferior branch (P3) of the portal vein. P4, the left paramedian branch of portal vein. e, f The lateral inferior branch (G3) and lateral superior branch (G2) of Glisson’s sheath were separately clipped and resected