不常见肝血管瘤的影像学特征

Imaging Features of Uncommon Hepatic Haemangiomas

目的探讨不常见肝血管瘤包括硬化性血管瘤和毛细血管瘤的影像学特征。方法对经病理证实的肝硬化性血管瘤和毛细血管瘤共7例影像学资料进行回顾性分析,分析总结其CT和MRI影像学特征。结果肝硬化性血管瘤5例,CT平扫呈不均匀稍低密度,2例病灶内见斑点状钙化,4例有包膜萎缩或病灶凹陷征象。增强CT动脉期病灶的边缘或内部出现斑点及结节状强化,3例病灶周围见斑片状灌注异常。门脉期除1例出现强化范围增大,3例在动脉期出现的强化灶未见增大或填充征象。延迟期5例病灶内部出现不同程度的不规则延迟强化。MRI表现:表现为边界不清的T1WI低信号,T2WI为不均匀高、低混杂信号,内部可见低信号区。2例为毛细血管瘤,表现为均匀的稍低密度或T2WI高信号,增强后强化均匀明显强化。结论肝硬化性血管瘤和毛细血管瘤罕见但具有一定特点,对其影像特征的认识可减少误诊率。

Objective To invaestigate the imaging features of the uncommon haemangiomas including sclerosed haemangioma and capillary haemangioma. Methods CT and MRI imaging data of 7 pathologically proved patients with pathologically proved sclerosed haemangiomas and capillary haemangiomas were retrospcetively analyzed. Results Results 5 cases ofwith sclerosed haemangiomas showed heterogeneous slightly low-density on plain CT, and 2 cases with calcification and 4 cases withshowed capsular retraction and decrease in size. After enchancement, nodular or rim enchancement were seenshowed in the arterial phase and 3 withcases showed the presence of transient hepatic attenuation. In the venous phase, 3 cases were absent of progressive enhancement except 1case. 5 cases were seenshowed different degrees of delayed enchancement in the dealayed phased phase. In MRI, the sclerosed haemangiomas showed low signal on T1 WI and heterogenous high and low signal on T2 WI with hypointense zone in the center. 2 cases ofwith capillary haemangiomas showed slightly low indensity or high signal on T2 WI, and with significant homogenous enhancement. Conclusionsonclusions Sclerosed haemangioma and capillary haemangioma are rare but has some specific imaging features; the cognition of its imaging features can make accurate diagnosis possibleility.