Fig. 4

Schematic diagram of preoperative 3DVE classification of hilar cholangiocarcinoma. 3DVE type I: tumor involving common hepatic duct. 3DVE type I: tumor involving hepatic duct confluence and unilateral or bilateral hepatic ducts without involvement of P point and U point, and without vascular involvement or hepatic atrophy. 3DVE type II: tumor involving unilateral P or U point and without, or tumor involving unilateral HA of PV, or unilateral hepatic atrophy, and without contralaterally involving limit of bile duct dissection, HA and PV, and without contralateral hepatic atrophy. 3DVE type III: tumor involving both P and U points; tumor involving unilateral limit of bile duct dissection with contralateral vascular invasion or hepatic atrophy; main portal venous involvement or main hepatic arterial involvement; insufficient FLR volume; metastasis to celiac, portacaval or paraaortic lymph nodes, or distant metastasis