biliary tract cancer
(BIH-lee-AYR-ee … KAN-ser)
A rare cancer that forms in the cells that line the bile ducts, gallbladder, or ampulla of Vater (the area where the bile ducts from the liver and pancreas join and enter the first part of the small intestine). Biliary tract cancers tend to grow and spread quickly. They are usually diagnosed at an advanced stage and have a poor prognosis (outcome).