Risk factors and classifications of hilar cholangiocarcinoma

Figure 2 Bismuth-Corlette classification of Perihilar (Klatskin) tumors. TypeI: Proximal bile duct tumor that do not extend to the bifurcation; TypeII: Tumor extend to the bifurcation without extension into the intrahepatic bile ducts; TypeIIIa: Tumoral occlusion of the common hepatic duct and the right hepatic duct; TypeIIIb: Tumoral occlusion of the common hepatic duct and the left hepatic duct; Type IV: Tumor involving the confluence and both the right and left hepatic ducts.