Extrahepatic biliary cancer: New staging classification

Figure 5 T-staging for proximal bile duct tumors. A: T1 tumors are confined to the bile duct wall without extension to the periductal fat; B: The T2 tumors extend to the periductal fat or the liver; C: T3 tumors have unilateral extension to the portal vein (arrow) or hepatic artery; D: T4 tumors extend to the main portal vein (arrow), common hepatic artery, secondary biliary radicles, or contralateral vascular extension.