CT imaging features,pathological basis and differential diagnosis of fat-poor hepatic angiomyolipoma in the back-ground of non-cirrhotic liver

JIANG Tianjiao; HU Yanjiao; WANG Jiachen; LIU Huaxiu; LI Wei

Abstract：Objective To investigate imaging features of fat-poor hepatic angiomyolipoma(fpHAML)in non-cirrhotic livers in order to enhance the diagnostic accuracy of this condition.Methods Clinical and imaging data of 19 patients with pathologi-cally confirmed fpHAML were retrospectively analyzed,and all patients underwent plain CT scan and dynamic enhancement ex-amination.Results Among the 19 patients,16(84.21%)patients had no clinical symptoms.All patients had no history of hepa-titis,liver cirrhosis and tuberous sclerosis.There were 20 lesions in 19 patients,and no macroscopic fat,calcification,hemor-rhage,necrosis and tumor capsule were detected in 20 lesions.All the lesions showed even/uneven and marked enhancement on AP,and the degree of enhancement was significantly higher than that of adjacent hepatic parenchyma.In 8 cases,the enhance-ment of portal phase was higher than that of arterial phase.Multipleintra-tumor vessels could be seen in the tumor,and the le-sions with diameter larger than 3.0cm were more common.The degree of enhancement of 18(90.00%)lesions on the portal phase(PP)or delayed phases(DP)was slightly higher than or equal to the surrounding normal liver parenchyma.Only 6(7.50%)cases showed the presence of early draining vein.10(50.00%)lesions had a tendency to increase the enhancement range.11(55.00%)lesions revealed vascular walk-like delayed mild enhancement area.Conclusion The CT features of fpHAML have certain specificity.As a result,an increased awareness of fpHAML is needed among radiologists.