Diagnosis of intrahepatic peripheral cholangiocarcinoma with CT

Objective To study the CT features of intrahepatic peripheral cholangiocarcinoma.Methods The CT features of 22 cases of surgically and pathologically confirmed intrahepatic peripheral cholangiocarcinoma were retrospectively reviewed.Results On unenhanced CT,the lesions were of low density with ill defined border.On enhanced scanning,moderate enhancement was observed at the edge of the lesions.Double-stage CT scanning showed characteristic enhancement from the periphery toward the center of the lesions. Focal dilatation of the intrahepatic bile ducts around the tumor was seen and retraction of liver capsuie,delayed enhancement,putrescence patch which was completely liquefied.Conclusion To some extent,the image features of intrahepatic peripheral cholangiocarcinoma are characteristic.They are useful for differentiating tumors from other space occupying lesions in the liver.