The Study Of Transient Hepatic Attenuation Differences In Left Lobe With MSCT

Objective:To explore the form,shape and mechanism of the transient hepatic attenuation differences in left lobe with MSCT,in order to improve the understanding of the transient hepatic attenuation differences in left lobe.Methods :Screening consecutive patients who were in accordance with the unified scanning program of double phase enhanced CT-arterial phase and portal venous phase using retrospective analysis method from December 2015 to December 2016,collecting the transient attenuation differences in left hepatic lobe,and recording its form,shape,whether there was related diseases and whether there was hepatic artery variation which was classified by Hiatt classification,and last analyzing the correlation between the causes,shape and hepatic artery variation of transient attenuation differences in left hepatic lobe.Results:There were 179 cases met the inclusion criteria,The MSCT imaging was increased in the arterial phase of the affected area in left hepatic while the plain and the portal venous phase scan were density.Check to see 114 cases of normal group,which the distribution were all hepatic lobes or hepatic segments,and multiple hepatic segments appeared in the majority at the same time(89/114).Liver S2 distribution in 18 cases(Corresponding vascular variation: Hiatt type?2 case,Hiatt type ? 2 casese,Hiatt type ? 1 cases,Hiatt type ? 8 cases,celiomesenteric trunk 3 cases,large diameter of the left hepatic artery?right hepatic artery from the celiac trunk respectively 1 cases),Liver S3 distribution in 6 cases(Corresponding vascular variation: Hiatt type ? 5 casese,Hiatt type ? 1 cases),liver S2 and S3 distribution in 50 cases(Corresponding vascular variation: Hiatt type?8 cases,Hiatt type ? 31 casese,Hiatt type ? 1 cases,Hiatt type ? 4 cases,Hiatt type ? 2 cases,large diameter of the left hepatic artery 4 cases),liver S2? S3 and S4 distribution in 40 cases(Corresponding vascular variation: Hiatt type? 1 case,Hiatt type ? 17 casese,Hiatt type ? 7 cases,Hiatt type ? 2 cases,Hiatt type ? 5 cases,large diameter of the left hepatic artery 4 cases,right hepatic artery from the celiac trunk 3 cases,celiomesenteric trunk 1 case).Check to see 65 cases of disease group,The different shape of transient hepatic attenuation differences in left lobe including:Irregular lamellar distribution in 31 cases(Corresponding diseases:Neoplastic lesion 21 cases,Inflammatory lesions 4 cases,Biliary tract diseases 2 cases,The pressure of disease around the liver 1 case,The lesion of left hepatic lobe with hepatic artery variation 3 cases),Strip-type distribution in 9 cases(Corresponding diseases:Liver biopsy 5 cases,The pressure of disease around the liver 4 cases),Arc/semicircle distribution in 7 cases(all are caused by Biliary tract diseases),Lobes/segment distribution in 13 cases(Corresponding diseases:The pressure of disease around the liver 1 case,The lesion of left hepatic lobe with hepatic artery variation 12 cases),Segment and lamellar distribution in 5 cases(Corresponding diseases:Portal venous obstructive diseases 1 case,The lesion of left hepatic lobe with hepatic artery variation 4 cases).The statistical result of normal group showed:(1)There was statistic difference between different segment distribution of the transient hepatic attenuation differences in left lobe and hepatic artery variation types(P<0.05);(2)The coefficient of association between different segment distribution and hepatic artery variation types of the transient hepatic attenuation differences in left lobe was 0.584(P<0.001),There was correlation between different segment distribution of the transient hepatic attenuation differences in left lobe and hepatic artery variation types;(3)Compared with liver S2 distribution,liver S2 and S3 distribution,liver S2? S3 and S4 distribution all had statistic difference;and then compared with liver S2 and S3 distribution,liver S2 ? S3 and S4 distribution had statistic difference(P<0.0083).The statistical result of disease group showed:(1)There was statistic difference between different shape of the transient hepatic attenuation differences in left lobe and its causes(P<0.05);(2)The coefficient of association between different segment distribution and hepatic artery variation types of the transient hepatic attenuation differences in left lobe was 0.842(P<0.001),There was a significant correlation between different shape of the transient hepatic attenuation differences in left lobe and its causes;(3)Compared with lobes/segment group,Arc/semicircle group,strip-type group,irregular lamellar group all had statistic difference about the causes,Compared with arc/semicircle group,strip-type group,irregular lamellar group,segment and lamellar group all had statistic difference about the causes,Compared with strip-type group,irregular lamellar group,segment and lamellar group all had statistic difference about the causes,Compared with irregular lamellar group,segment and lamellar group had statistic difference about the causes(P<0.005).Conclusions:The distribution of transient hepatic attenuation differences in left lobe could be characterized by a variety of forms,and the shape of transient hepatic attenuation differences in left lobe is different which lead to by different causes,but they have some certain characteristic,and it c ould have implications for causes of transient hepatic attenuation differences in left lobe.