Abstract: Objective To analyze the Multislice CT(MSCT) and MRI features of insulinoma. Methods MSCT and MRI findings in eighteen patients with surgical-pathologically-proved insulinoma were retrospectively analyzed. Results Seventeen cases of insulinoma had only one single tumor in every patient, except one case had three lesions. The range of the maximum diameter was between 0.3 and 2.0cm. Most of the insulinoma appeared iso-density and light hypo-density on CT plain scan. MRI showed hypo-intensity signal and light hypo-intensity signal on T1WI and hyper-intensity signal and light hyper-intensity signal on T2WI. These cases showed intensely enhancement on the arterial phase and iso-enhancement on the parenchymal and portal venous phases on 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 relevant ratio of the insulinoma can be significantly improved by rational utilization of DCE MSCT and MRI.

Key words: Insulinoma, Diagnosis, Multidetector Computed Tomography, Magnetic Resonance Imaging

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0.3～2.0 cm。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。

关键词: 胰岛素瘤, 诊断, 多层螺旋CT检查, 磁共振成像