A malignant mesenchymal tumor with skeletal muscle differentiation, arising from the extrahepatic bile ducts. The disease is extrahepatic bile duct rhabdomyosarcoma (MONDO_0002577). Also known as: bile duct rhabdomyosarcoma (disease), extrahepatic bile duct rhabdomyosarcoma (disease), rhabdomyosarcoma (disease) of extrahepatic bile duct, rhabdomyosarcoma of extrahepatic bile duct, rhabdomyosarcoma of the bile duct, rhabdomyosarcoma of the extrahepatic bile duct.