腹盆腔孤立性纤维瘤MRI表现

MRI Findings of Solitary Fibrous Tumor in Abdomen and Pelvis

目的探讨腹盆腔孤立性纤维瘤的MRI特征,以期提高诊断水平。方法回顾性分析经手术病理证实的16例孤立性纤维瘤的MRI表现。结果16例中有5例为多发,11例为单发病灶,共21个病灶;类圆形12个,椭圆形3个,不规则形6个;16例病灶边界均清晰;MRI平扫T_(1)WI多呈低信号或等信号,T_(2)WI多呈稍高或等低高混杂信号,1个病灶T_(2)WI呈低信号;11个病灶伴有囊变或坏死;9个病灶内部或周边可见血管流空信号影;DWI多呈等或稍高信号;MRI增强扫描所有病灶动脉期均呈不均质强化,12个病灶实性部分静脉期及延迟期呈中-重度渐进性均匀强化,9个病灶静脉期及延迟期呈不均质或分隔状持续强化。结论腹盆腔孤立性纤维瘤MRI表现具有一定特征性,病灶边界、MRI信号特征及强化方式等MRI征象对本病诊断具有一定帮助,但最终确诊仍依赖于病理学检查。

Objective To investigate the MRI features of solitary fibrous tumor in abdomen and pelvis in order to improve the diagnosis.Methods MRI findings of 16 cases of solitary fibrous tumor confirmed by surgery and pathology were retrospectively analyzed.Results There were 21 lesions in 16 cases with two lesions in five cases.The shape of the tumors showed round-like(n=12),oval(n=3)and irregular(n=6).16 of them displayed a clear boundary.Most of the lesions displayed hypo-oriso-intense signal on T_(1)WI and slightly hyperintense signal and hypo hyper or mixed intensity on T_(2)WI.The lesions were accompanied by cystic change or necrosis in 11 cases.In 9 cases,there were signs of vascular signal voids in or around the lesion.Most of the lesions showed iso-or slightly hyperintense signal on T_(2)WI.In contrast,all lesions presented heterogeneous enhancement in the arterial phase,12 cases presented moderate to severe progressive homogeneous enhancement in the solid partial venous phase and delayed phase,and 9 cases presented heterogeneous or septal continuous enhancement in the venous phase and delayed phase.Conclusion The MRI findings of solitary fibrous tumor in abdomen and pelvis have certain characteristics,and the combination of lesion boundary,MRI signal characteristics and enhancement is helpful in improving the diagnostic value of MRI in solitary fibrous tumor,but the final diagnosis still depends on pathological examination.