目的 探讨少见部位炎性肌纤维母细胞瘤（IMT）的CT与MR表现，提高对其认识水平。方法 回顾性分析6例经手术病 理证实的IMT（直肠1例，双侧输尿管末端1例，腿部软组织3例，右肾1例）患者的影像学资料，其中2例行CT扫描， 4例行MR扫描。结果 直肠IMT呈边缘清楚的带蒂等密度实性肿块，增强扫描明显渐进性均匀强化。输尿管IMT呈边缘 欠清的等密度实性肿块，增强扫描明显渐进性均匀强化。3例腿部软组织IMT呈境界清楚的软组织肿块，MRI平扫信 号不一(1例T1WI序列呈等信号、T2WI序列呈混杂稍高信号，1例T1WI序列呈稍低信号、T2WI序列呈低信号，1例呈 T1WI序列呈混杂稍高信号、T2WI序列呈混杂等信号)，增强扫描均明显强化。右肾IMT呈囊实性肿块，实性部分T1WI 呈等信号、T2WI呈稍低信号，囊性部分T1WI呈稍高信号，T2WI呈高信号，增强扫描肿块实性部分及囊壁明显强化。 结论 CT及MR能准确显示IMT的发生部位、大小、形态、累及范围，在定性诊断方面价值有限，确诊需依赖病理学检 查。

Obojective To investigate the CT and MRI features of inflammatory myofibroblastic tumor(IMT) in unusual sites. Methods Six cases of IMT confirmed by surgical pathology were retrospectively analyzed, including 1 rectal IMT, 1 bilateral ureteral IMT, 3 leg soft tissue IMT and 1right renal IMT. CT scan was performed in 2 patients and MRI was performed in other 4 patients. Results Plain CT showed isodensity pedunculated rectal IMT with an clear margin, which was obviously progressive enhanced after contrast enhancement. Bilateral ureteral IMT was showed as a isodensity solid mass with an unclear margin, which had a remarkable progressive enhancement. Plain MRI showed very different signal of 3 cases soft tissue IMT which were all significantiy enhanced after contrast enhancement. Right renal IMT was seen as a Cystic or solid mass. the solid part showed isointensity on T1WI and slightly low intensity on T2WI. The cystic part was mildly hypointensity on T1WI but hypointensity on T2WI.The solid node and cystic wall enhanced after contrast enhancement. Conclusion CT and MR can accurately show the location, size, shape and involving scope of IMT, but has limited value in qualitative diagnosis, the definitive diagnosis was made by pathological examination.