ABSTRACT
Objective To investigate the multi-phase dynamic spiral CT findings of small hepatic hemangioma with arterioportal shunts,and to discuss its mechanism and influencing factors.Methods Multi-phase dynamic contrast-enhancement CT findings of 52 small hepatic hemangiomas in 33 cases were analyzed retrospectively.The criteria for diagnosing arterioportal shunts were as follow:①Transient wedge-shape or irregularly shape homogenous enhancement in the liver parenchyma adjacent to the tumor on hepatic arterial phase and slight hyper-or iso-attenuation in the area on portal venous phase and delayed phase;②Some branches of portal vein showed early appearance within the wedge-shaped homogenously hyper-attenuating area on the arterial phase.The correlation between the enhancement patterns of homangiomas and the prevalence of arterioportal shunts in small hepatic homangiomas were analyzed.Results Arterioportal shunts were found in 13(25%)of 52 small hepatic hemangiomas,all of them showed transient wedge-shaped enhancement peripheral to the tumor and in 7 of 13 hemangiomas showed early enhancement of branches of the portal veins on the arterial phase.Eleven(52.4%)of the 21 small hepatic hemangiomas with rapid enhancement had arterioportal shunt shunts,whereas only 2(6.5%)of the 31 hemangiomas with slow enhancement had arterioportal shunt shunts(P