NCIt related terms : Stage IVA Hilar Cholangiocarcinoma;
NCIt definition : Stage IVA includes: T4, N0-1, M0. T4: Tumor invades the main portal vein or its branches
bilaterally; or the common hepatic artery; or the second-order biliary radicals bilaterally;
or unilateral second-order biliary radicals with contralateral portal vein or hepatic
artery involvement. N0: No regional lymph node metastasis. N1: Regional lymph node
metastasis (including nodes along the cystic duct, common bile duct, hepatic artery,
and portal vein). M0: No distant metastasis. (from AJCC 7th Ed.);