Rhabdomyosarcoma are reportedly the most common soft tissue sarcoma occuring in childhood, but the biliarytree is a rare site of origin for this tumor. Recently we experienced a case of embryonal rhabdomyosarcoma of thebiliary tree in a 30-month-old child. Ultrasonography showed hypoechoic mass filling the dilated left.intrahepatic & extrahepatic bile ducts, and CT showed hypodense mass with heterogeneous enhancement after contrastinfusion. Intraoperative cholangiography showed filling defects within the dilated left. intrahepatic &extrahepatic bile ducts. Postoperative MRI showed residual mass within the left. intrahepatic duct which washypointense on T1WI and hyperintense on T2WI.