Fig. 1

Imaging data of one patient who underwent mesohepatectomy with caudate lobectomy. The 3D reconstruction model showed that the tumor (yellow) invaded the right anterior branch of the hepatic artery (a). The tumor clung to the roots of the left portal vein and right anterior portal vein (b). The location of the tumors in relation to the bile duct (c). Anatomical structure after mesohepatectomy with caudate lobectomy (d). Shaping the B2 and B3 biliary branches, B6 and B7 biliary branches, respectively (e–f). Two choledochojejunostomy operations were performed (white arrow) (g). RAHA: right anterior branch hepatic artery; PV portal vein, LPV left hepatic portal vein, RAPV right anterior branch hepatic portal vein, LHA left hepatic artery