<unk>  is a tumor of the connective tissues of the bile ducts. Primary risk factors for<unk>  are Primary Sclerosing Cholangitis and infection by Clonorchis Sinensis (a fluke found in undercooked fish).
Cholangiosarcoma
Cholangiocarcinoma
Liver angiosarcoma
Echinococcosis
Pancreatoblastoma
Periampullary cancer
Pancreatic cyst
Alveolar hydatid disease