Analysis of extrahepatic bile duct carcinomas according to the New American Joint Committee on Cancer staging system focused on tumor classification problems in 222 patientsPresented in part at the 93rd Annual Meeting of the United States and Canadian Academy of Pathology, Vancouver, British Columbia, Canada, March, 2004 (winner of the Pathologist‐in‐Training Award for Outstanding Scientific Presentation from the Hans Popper Hepatopathology Society).