extrahepatic bile duct signet ring cell carcinoma (MONDO_0002664) is an adenocarcinoma that arises from the extrahepatic bile ducts. It is characterized by the presence of signet ring malignant epithelial cells. Also known as: bile duct signet Ring cell carcinoma, bile duct signet ring cell carcinoma, extrahepatic bile duct signet Ring cell carcinoma, signet Ring cell bile duct carcinoma, signet Ring cell carcinoma of bile duct, signet Ring cell carcinoma of the bile duct.