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目的探讨胰岛素瘤的多层螺旋CT(MSCT)和磁共振成像(MRI)的影像表现特征。方法回顾性分析2008年11月至2010年11月期间四川大学华西医院8例经手术病理证实的胰岛素瘤的MSCT及MRI表现,并与临床病理结果进行对照分析。6例行MRI检查,4例行MSCT检查,其中2例同时行MRI和MSCT检查。结果 8例胰岛素瘤均为单发,直径0.5~3.5 cm。MSCT平扫呈等密度或稍低密度结节,MRI平扫呈长T1、长或稍长T2信号结节,其中4例弥散加权成像呈较高信号改变。MSCT及MRI动态增强扫描后动脉期强化,门脉期和延时期强化减弱。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和MRI均能清楚显示胰岛素瘤,并且MRI较MSCT能提供更多的诊断信息。
Objective To investigate the imaging features of insulinoma by multi-slice spiral CT (MSCT) and magnetic resonance imaging (MRI). Methods We retrospectively analyzed the MSCT and MRI findings of eight cases of insulinoma confirmed by pathology in West China Hospital of Sichuan University from November 2008 to November 2010 and compared them with the clinicopathological findings. Six patients underwent MRI examination and four patients underwent MSCT examination. Two of them underwent MRI and MSCT simultaneously. Results 8 cases of insulinoma were single, diameter 0.5 ~ 3.5 cm. MSCT showed equal density or slightly lower density of nodules, MRI scan showed long T1, long or slightly longer T2 signal nodules, of which 4 cases of diffusion-weighted imaging showed a higher signal change. MSCT and MRI dynamic contrast-enhanced arterial phase after enhanced scan, portal phase and delayed enhanced weakening. Conclusion The imaging findings of insulinoma have certain characteristic, reflecting the pathological features of insulinoma. Insulinomas are clearly visible on both MSCT and MRI, and MRI provides more diagnostic information than MSCT.