[A malignant tumor arising from the epithelium of the intrahepatic or extrahepatic bile duct. Intrahepatic bile duct carcinomas are adenocarcinomas and are called cholangiocarcinomas. Extrahepatic bile duct carcinomas are adenocarcinomas, adenosquamous carcinomas, squamous cell carcinomas, small cell carcinomas, or mucoepidermoid carcinomas. — 2004 ( NCI )]
UMLS (NCI) C0740277Bile Duct Carcinoma