肝脏血管平滑肌脂肪瘤的CT表现

目的 探讨肝脏血管平滑肌脂肪瘤(HAML)的CT特征及诊断价值,提高对其诊断的准确率.方法 回顾性分析12例经手术病理证实HAML的各期CT表现,其中8例动脉期、门脉期加做薄层CT扫描,5例加做MRP、MIP、VR等后处理技术.结果 12例中女性10例,右肝7例,左肝5例,其中2例呈外生性.CT平扫12个病灶皆为低密...

CT appearances of hepatic angiomyolipoma (HAML)

Objective To study the imaging features of hepatic angiomyolipoma （HAML） on CT so as to improve the diagnostic accuracy. Methods CT findings of 12 cases with pathologically-proved hepatic angiomyolipoma were retrospectively summarized and analyzed, additional thin slice scan was done on arterial phase and portal phase in 8 cases, multi-planar reconstruction （MPR）, maximum intensity projection （MIP） and volume rendering technique （VR） were carried out in 5 cases. Results Of the 12 patients, 10 were female. 7 lesions were located in right hepatic lobe, 5 were in left hepatic lobe, in which 2 lesions outgrew from hepatic lobe. 12 lesions appeared as hypo-density on pre- contrast CT scan. The first group consisted of 7 lesions with inhomogeneous density and fat density, which could be measured with CT values〈-20HU. The soft tissue component of the 7 lesions were markedly and unevenly enhanced on arterial phase and continued on portal phase. Then the density reduced on parenchymal phase. The second group consisted of 5 lesions with homogeneous density. One lesions was fat density with CT values of -54HU without marked enhancement on contrast scanning. Most part of the other 4 lesions were soft tissue density with markedly enhanced on arterial phase and continuously enhanced on portal phase, equidensity in 1 lesion and low density in the other 3 lesions on parenchymal phase. The central vascular structure could be seen in 5 lesions on arterial phase and/or portal phase, and one of that led into hepatic vein. Conclusion Although the CT appearances of HAML showed with different components of the tumor, it will be helpful to improve the diagnostic accuracy before surgery if the characteristic CT appearances of HAML were accurately grasped.