fig2

Figure 2. Bismuth-Corlette classification of hilar cholangiocarcinoma (hCCA). Type I is located distally to the hepatic duct confluence; type II involves the confluence. Type III also involves the confluence and the proximal right hepatic duct (type IIIa) or proximal left hepatic duct (type IIIb). Type IV involves bilateral proximal hepatic ducts or is multicentric. hCCA: hilar cholangiocarcinoma; GB: gall bladder; CD: cystic duct; RHD: right hepatic duct; LHD: left hepatic duct; CHD: common hepatic duct; CBD: common biliary duct.