A<unk>  is a cholangiocarcinoma (cancer of the biliary tree) occurring at the confluence of the right and left hepatic bile ducts. Because of their location these<unk> rs present late and therefore are usually not resectable at the time of presentation.
Klatskin tumor
Ganglion cyst
Acrospiroma
Epidermoid cyst
Trichoblastoma
Malignant acrospiroma
Cylindroma
Hamartoma