CT和MRI对胰岛素瘤的诊断价值  

Diagnostic value of CT and MRI in the insulinoma

作　　者：陈玥瑶[1] 林笑丰[1] 谢明伟[1] 胡辉军[1] 余太慧[1] 易志龙[1] 

机构地区：[1]中山大学孙逸仙纪念医院放射科,广州510120

出　　处：《岭南现代临床外科》2012年第6期415-418,共4页Lingnan Modern Clinics in Surgery

基　　金：广东省自然科学基金(9151008901000001)

摘　　要：目的探讨胰岛素瘤的多层螺旋CT(MSCT)和磁共振成像(MRI)的影像学特征。方法回顾性分析18例经手术病理证实的胰岛素瘤的MSCT及MRI表现。结果 18例胰岛素瘤除1例为多发外其余均为单发,最大径0.3～2.0cm。MSCT平扫多呈等密度或稍低密度结节,MRI平扫病灶呈T1WI为低或稍低信号,T2WI为高或稍高信号。MSCT及MRI动态增强扫描动脉期明显强化,实质期和门脉期强化降为等密度。结论胰岛素瘤的影像学表现具有一定的特征性,反映了胰岛素瘤的病理特点。MSCT动态增强应作为胰岛素瘤首选筛查手段,合理使用MSCT动态增强与MRI检查能显著提高诊断胰岛素瘤的检出率。Objective To investigate the image features of Multislice CT(MSCT) and MRI for insulinama.Methods MSCT and MRI findings in eighteen patients with surgical-pathologically-proved insulinoma were retrospectively analyzed.Results Eighteen cases of insulinoma had only one single tumor in all patients except one case with three lesions.The diameter of tumor ranged from 0.3 cm to 2.0 cm.Most of the insulinoma appeared iso-density and slight hypodensity on CT plain scan.MRI showed hypointensity signal and slight hypointensity signal on T1WI and hyperintensity signal and slight hyperintensity signal on T2WI.These cases showed intensely enhancement on the arterial phase and iso-enhancement on the parenchymal and portal venous phases of dynamic contrast enhancement(DCE) MSCT and DCE MRI.Conclusion The insulinoma reveals some characteristic imaging features,which were based on the pathological changes.DCE MSCT should be the preferred means of screening insulinoma.The detectable rate of the insulinoma could be significantly improved by rational utilization of DCE MSCT and MRI.

关 键 词：胰岛素瘤 诊断 多层螺旋CT检查 磁共振成像 

分 类 号：R445.2[医药卫生—影像医学与核医学] R445.3[医药卫生—诊断学]