卵巢卵泡膜细胞瘤MR动态增强与扩散加权成像的表现特征

Analysis of dynamic contrast enhanced and diffusion weighted MRI imaging features of ovarian thecoma

目的：探讨卵巢卵泡膜细胞瘤的MR动态增强扫描（DCE）与扩散加权成像（DWI）表现特征,提高其正确诊断率。方法：回顾性分析经病理检查证实的30例卵巢卵泡膜细胞瘤的MRI影像资料,分析肿瘤的MRI表现,尤其是DCE及DWI特征。结果：30例肿瘤MRI平扫T1WI呈等或稍低信号,T2WI呈等或稍高信号,T2WI抑脂序列呈高信号;所有病例DWI均呈高-稍高信号,ADC值范围为（1.182±0.65）×10^-3 mm^2/s;动态增强扫描中24例病灶为I型曲线,6例为II型曲线;所有病灶第一分钟强化率为86.64%～87.99%,与正常卵巢对比,两者之间差异有统计学意义。结论：卵泡膜细胞瘤具有一定的MRI表现特征,结合DCE及DWI的特征能对诊断提供很大帮助。

Objective：To investigate dynamic contrast enhanced（DCE）MRI and diffusion weighted MR imaging（DWI）characteristics of ovarian thecoma,so as to improve the rate of correct diagnosis.Methods：The MR image data of 30 patients with pathologically proved ovarian thecoma were analyzed retrospectively and the MRI manifestations especially the DCE and DWI features of tumor were analyzed.Results：In 30 cases of the tumor,MRI plain scan showed isointensity or hypointensity on T1 WI,isointensity or hyperintensity on T2 WI,hyperintensity on fat-suppressed T2 WI,and hyperintensity or slight hyperintensity on diffusion weighted imaging（DWI）in all cases,and the range of ADC value was（1.182±0.65）×10^-3 mm^2/s.24 lesions showed typeⅠ curve in DCE scanning and 6lesions showed typeⅡ curve.The enhancement rate in the first minute in all lesions was 86.64～87.99%,which had statistic difference when it was compared with normal oyaries.Conclusion：MRI manifestations of ovarian thecoma have certain characteristics,the diagnosis accuracy of MRI can be improved when MRI combined with DCE and DWI features.