What is the Memorial Sloan-Kettering Cancer Center Staging System (MSKCC)?

T1 (tumor involve biliary confluence w/ or w/out extension to secondary radicles) T2 (T1 and ipsilateral portal vein involvement/hepatic lobe atrophy) T3 (T2 + contralateral involvement/bilateral portal vein/main portal vein involved) Used for perihilar cholangiocarcinoma