Source:http://linkedlifedata.com/resource/umls/id/C0238019
NCI: A rare cancer that forms in the part of the bile duct that is outside the liver. The bile duct is the tube that collects bile from the liver and joins a duct from the gallbladder to form the common bile duct, which carries bile into the small intestine when food is being digested.,NCI: A carcinoma that arises from the extrahepatic bile ducts. The majority are adenocarcinomas.