MONDO_0021299 (carcinoma in situ of extrahepatic bile duct) is a in situ carcinoma that involves the extrahepatic bile duct. Also known as: carcinoma in situ of extrahepatic bile ducts, carcinoma in situ of extrahepatic biliary ducts, carcinoma in situ of the extrahepatic bile duct, extrahepatic bile duct cancer stage 0, extrahepatic bile duct carcinoma in situ, extrahepatic bile duct in situ carcinoma, extrahepatic biliary duct carcinoma in situ, stage 0 carcinoma of extrahepatic bile duct.