Peripheral cholangiocarcinoma with extensive tumor thrombi in the portal venous system: case report

Peripheral cholangiocarcinoma is a primary liver tumor, with some features that distinguish it from hepatocellular carcinoma, especially the low incid ence of vascular involvement relative to mass size. Radiologically, tumor t hrombus seen as an expanding central filling defect is a rare finding of ch olangiocarcinoma on computed tomography, even though microscopic invasion o r vascular encasement has been reported in a few studies. We report a case of a peripheral cholangiocarcinoma with tumor thrombus expanding and spread ing from the portal vein to the superior mesenteric vein.