Purpose : To evaluate the radiological patterns of vascular invasion in peripheral cholangiocarcinomas.Materials and Methods : Hepatic arteriography and portography in 20 cases with cholangicarcinoma including 12cases with angiographic CT were retrospectively analized. Results : The arteriography showed no arterioportalshunt, hypertrophy of tumor vessel, or tumor staining extending to central portion of the mass in all cases.However, doughnut shaped peripheral tumor staining was seen until late hepatogram phase in 12 cases andcompensatory hyperperfusion around the mass was seen in six cases (eight cases if include arterial CT). Encasementof tumor vessel was seen in 12 cases, and hypertrophy of feeding vessel in nine cases. On portogrphy, the fillingdefect on segmental portal branch could be demonstrated only in 11 cases. Shape of the portal defect was taperednarrowing in six cases. abrupt narrowing in two cases but intraluminal nodular filling defect was not seen.Remainning three cases were difficult to define the shape. On seven cases of CT during arterial portography, threecases showed mass shaped defect and four showed segmental defect but three of them could demonstrate the partiallypreserved portal flow in defective portal area. Conclusion : Hepatic arteriography in peripheral cholagiocarcinomashowed no evidence of hypertrophy of tumor vessels and tumor stain extending to central portion but peripheralstaining on late hepatogram phase and compensatory hyperperfusion could be seen. Portal vein was more commonlyinvolved through perivascular connective tissue invasion rather than by direct extension into the portal lumen.