35. Extrahepatic Cholangiocarcinoma T1 confined to the bile duct T2 invades beyond the wall of the bile duct T3 invades the liver, gallbladder, pancreas, and/or unilateral branches of the portal vein or hepatic artery T4 Invades any of the following: main portal vein or its branches bilaterally, common hepatic artery, or other adjacent structures, such as the colon, stomach, duodenum, or abdominal wall N1 Regional lymph node metastasis M1 Distant metastasis Stage IA T1 N0 M0 Stage IB T2 N0 M0 Stage IIA T3 N0 M0 Stage IIB T1 – T3 N1 M0 Stage III T4 Any N M0 Stage IV Any T Any N M1
36. Intrahepatic Cholangiocarcinoma T1 Solitary tumor without vascular invasion T2 Solitary tumor with vascular invasion or multiple tumors none >5 cm T3 Multiple tumors >5 cm or tumor involving a major branch of the portal or hepatic veins T4 Tumor(s) with direct invasion of adjacent organs other than the gallbladder or with perforation of visceral peritoneum N1 Nodal metastases to the hepatoduodenal ligament M1 Any distant metastases Stage I T1 N0 M0 Stage II T2 N0 M0 Stage IIIA T3 N0 M0 Stage IIIB T4 N0 M0 Stage IIIC Any T N1 M0 Stage IV Any T Any N M1