Extrahepatic biliary cancer: New staging classification

Figure 2 Hilar tumor classification. A: Type  I hilar tumors are proximal bile duct tumors that do not extend to the bifurcation; B: Type II tumors extend to the bifurcation without extension into the intrahepatic bile ducts; C:Type IIIa proximal bile duct tumors correspond to tumors that extend to the right intrahepatic bile ducts; D: Type IIIb proximal bile duct tumors correspond to tumors that extend to the left intrahepatic bile ducts; E: Type IV tumors extend to the right and left intrahepatic bile ducts.