Fig. 1

Segmentation process in a patient planned for left hemihepatectomy with resection of the MHV due to intrahepatic CC a) Plain axial CT image at the level of the maximum tumor extension shows the hypoattenuated tumor in the atrophic left liver lobe (black arrows) with upstream cholestasis (white arrowheads). b) and c) Detection of the liver outline. d) – f) Detection of the intrahepatic PV (in pink) and HV (in blue). Note occlusion of the left PV and of branches of the MHV and left HV due to tumor invasion. g) – h) Definition of the transection plane (in red)