摘要：Objective To explore the imaging features of extrapleural solitary fibrous tumor ,thoreby enhancing the un‐derstanding the imaging manifestation and reducing the ratio of misdiagnosis .Methods Ten cases of extrapleural solitary fibrous tumor were retrospectively analyized by the imaging findings of CT and MRI ,and the imaging findings with addi‐tion of pathological manifestations were compared .Results Among ten cases of extrapleural solitary fibrous tumor ,there were six cases in the encephalic .Three cases was recurrent cases ,one case was malignant .There were one case in the pel‐vic cavity ,one case in the left knee joint ,one case in the left kidney ,one case in right ethmoid sinus ;4 cases were malig‐nant ,3 were low potential malignancy or borderline and 3 were benign tumors .The tumor size was between 1 .6 cm and 6.0 cm ,otherwise ,the average size was 3 .5 cm ;In terms of plain scanning ,there were 6 with clear boundary ,four cases with owed clear boundary or ill‐defined boundary .On the part of the tumor outline ,there were five cases with regular out‐line and five ones with irregular outline .Also ,one recidivist had polycystic separate like form .One case was with hemor‐rhage .Calcification was associated with eight cases confirmed by CT .In six‐intracerebral tumor ,five cases had marked e‐dema around the lesion ,one case with polycystic lesions had no marked edema .MRI MR showed low signal intensity on T1WI and diverse clinical manifestations on T2WI ,which mostly had high or mixed signal signal intensity .In the aspect of the enhancd scaning ,most of benign extrapleural solitary fibrous tumor had moderate "map like"strengthening and delayed reinforcement ,yet ,the larger lesion ,malignant ,and recurrent ones were heterogeneously enhanced .Conclusion Imaging findings of ESFT were of characteristics ,we should correctly understand its imaging features so as to reduce the rate of misdiagnosis ,but the final diagnosis still depends on pathology diagnosis .%目的：探讨胸膜外孤立性纤维瘤（ESFT ）的影像学特点，以提高对该病影像表现的认识，减少误诊率。方法回顾性分析10例经病理证实ESFT的CT、MRI表现，并对影像学表现与病理表现进行对照研究。结果10例ESFT病例中，6例位于颅内，1例位于盆腔，1例位于左膝关节，1例位于左侧肾脏，1例位于右侧筛窦；恶性者4例，低度恶性或交界性者3例，良性3例；瘤体直径1．6～6．0cm ，平均3．5cm ；平扫肿瘤边界清6例，欠清或不清的4例；瘤体轮廓规则5例，不规则5例，其中脑内1例复发者形态呈多囊分隔状；肿瘤伴出血1例，8例CT检查病例中钙化3例，6例颅内病例中5例病灶周围伴明显水肿，另1例多囊病灶不伴有明显水肿；M RI T1 WI上等低信号，T2 WI上信号表现多样，多呈等高或高低混杂信号；良性ESFT 增强后多呈轻中度“地图样”强化和延迟强化，较大病灶、恶性及复发ESFT 多呈不均匀明显强化。结论 ESFT 影像学表现具有一定的特征性，正确认识其影像表现，可以降低误诊率，但其最后确诊仍需依靠病理诊断。
