A 69-year-old man patient was hospitalized by confused mentality. He had chronic hepatitis B virus infection and was diagnosed with liver cirrhosis 20 years ago. Abdominal CT showed about 2×1 cm sized polypoid mass with mild arterial enhancement at the S4 of liver, causing moderate dilatation of the left IHBD. In the CTHA-AP, intraductal mass was hyperattenuated at arterial phase and washed out at portal phase. Celiac angiography revealed nodular tumor staining correlating to intraductal mass on CT. In MRCP and ERCP, a polypoid lesion was noted at the orifice of left main intrahepatic duct. The patient was treated with cyber-knife for 3 days with 3600 cGy. In follow up CT after 2 month of cyber-knife treatment, there was regression of previously noted left IHBD dilatation and no definite enhancing intraductal mass.