CT Features of Peripheral Intrahepatic Iholangiocarcinoma(PICC)

Obejective Investigating CT features in patients with peripheral intrahepatic cholangiocarcinoma,in order to improve the understanding about the distinctive manifestations of peripheral intrahepatic cholangiocarcinoma.Methods 22 cases of PICC underwent CT plain and enhanced scan were analyzed retrospectively which confirmed by pathology through surgery and needle biopsy.Results Single lesion was showed in 18 cases and multiple lesions were found in 4 cases.In the total of 27 lesions,15 were located in the left liver,9 cases in right lobe and 3 cases in both left lobe and right lobe.The sizes of lesions were from 3cm to 15cm with an average of 7.4cm.On plain CT scan,The lesions of 21 cases were shown low-density and the lesion of 1 case was shown slightly high density because of fatty liver.Masses were round,lobulated or irregular shape,On enhanced scan of arterial phase,17 cases were found minimal rim enhancement,1 case was shown sharp rim enhancement,and 4 cases appeared as non-enhangcement;1 case had luxury perfusion in liver tissue around;On enhanced scan of portal phase,All cases were shown mild to moderate enhancement and were manifested centriptally.Irregular linear and patchy enhancement were found inside the lesions..On enhanced scan of delayed phase,The lesions were enhangced continuously and further strengthened to the central filling.Conclusion The CT appearances of peripheral intrahepatic cholangiocarcinoma have it's characteristics and were important in the diagnosis and differential diagnosis.