Perihilar (also called hilar) … Another name for bile duct cancer is cholangiocarcinoma. Cholangiocarcinomas in these different groups cause different symptoms. Intrahepatic bile duct cancers. These cancers start in the smaller bile duct branches inside the liver.
https://www.cancer.org/cancer/bile-duct-cancer/about/what-is-bile-duct-cancer.html