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.) [from NCI]