肝细胞腺瘤的CT和MRI表现

目的探讨肝细胞腺瘤(HA)的CT和MRI表现.方法回顾性分析经手术病理证实的9例HA的影像资料,其中CT和MRI扫描各8例.结果 CT平扫呈等或略低密度影4/6例; CT增强扫描动脉期表现为均匀或不均匀明显高密度影4/6例;门静脉期表现为高密度或略高密度6/8例;3/5例在延迟期扫描表现为等密度.2例增强及延迟扫描均为低密度的病灶,病理显示其内明显脂肪变.7/8例在MR的T1WI为均匀或不均匀的高信号影,8/8例T2WI表现为均匀或不均匀中高信号影; MRI的动态增强扫描与CT增强扫描类似.结论影像检查能够正确诊断大部分肝脏腺瘤病例,MRI对显示HA病理特征优于CT.

maging manifestation of hepatocellular adenoma on CT and MRI

Objective To study the imaging features of hepatocellular adenoma(HA) on CT and MRI. Methods Imaging findings of 9 patients with histopathologically proven HA were retrospectively analyzed. Results The mean size of HA was 5 cm (3-12 cm). Four of 6 cases showed iso density or slight hypodensity on plain CT, while homogeneous or heterogeneous hyperdensity on arterial phase in 4/6 cases, hyperdensity or slight hyperdensity on portal venous phase in 6/8 cases, and iso density in 3/5 on delayed phase on CT. Two HA lesions were demonstrated as homogeneous hypodensity on all phases of post contrast scans which were corresponded to the fatty degeneration pathologically. Lesions showed homogeneous or heterogeneous hyperintensity in 7/8 on T1WI, and homogeneous or heterogeneous moderate hyperintensity in 8/8 on T2WI on MRI. Findings on dynamic enhanced MR imaging were similar to the enhance pattern of CT. Conclusion Correct imaging diagnosis is possible in majority of HA. MRI was better than CT on revealing the pathologic features of HA.