Perihilar Bile Duct Cancer pT4 TNM Finding v7

**Semantic type:** Finding

**Definition:** Perihilar bile duct cancer with tumor invading 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. (from AJCC 7th Ed.)