目的 分析大关节局限型良性滑 膜瘤的影像学表现以提高对该病的认识。 方法 回顾性分析25例病理证实的PVNS病 例的X线及MRI表现，其中10例证实为大 关节局限型良性滑膜瘤，1例做MR增强扫 描。结果 X线平片仅显示为局部稍高的软 组织肿块影，骨质均未见异常。MRI表现 为病变部位的软组织肿块影，呈T1WI低信 号，其内可见条状或片状的更低信号影， T2WI呈明显不均匀的高低混杂信号影，病 灶边界较清晰，增强扫描中度或明显强 化。结论 大关节局限型良性滑膜瘤影像 表现具有一定的特征性。

Objective To study the imaging features of localized benign synovioma of big joint. Methods 25 cases with pathology proved PVNS were retrospectively reviewed. Routine radiograph and MR exam were carried out in all of cases, and 1 case had contrast-enhanced MR imaging. 10 patients were proved localized benign synovioma. Results X plain film findings were soft-tissue mass without osseous involvement. MR imaging showed the lesions were heterogeneously iso-/hypo-intense on T1 weighted images, and heterogeneously hyper-/hypo-intense on T2 weighted images. The margin of lesions were clear and significantly enhanced. Conclusion The imaging findings of localized benign synovioma of big joint have some certain characteristics.