色素沉着绒毛结节性滑膜炎的MRI诊断

MRI diagnosis of pigmented villonodular synovitis

目的探讨色素沉着绒毛结节性滑膜炎的MRI表现特征。方法总结经手术病理证实的14例色素沉着绒毛结节性滑膜炎的临床及MRI资料,分析其MRI表现特征。结果14例色素沉着绒毛结节性滑膜炎均为弥漫型,其中位于膝关节12例,髋关节2例。MRI表现为关节腔内滑膜增生形成绒毛结节和肿块,结节内见长T1短T2低信号13例;关节软骨受侵蚀8例;关节韧带受侵蚀5例;关节积液10例;半月板受累2例。结论色素沉着绒毛结节性滑膜炎特征的MRI表现为关节内滑膜增生形成绒毛结节,以及结节内含铁血黄素在T1WI、T2WI上呈低信号,典型表现呈"海绵垫样"、"苔藓状"。

Objective To explore the MRI characteristics of pigmented villonodular synovitis. Methods MRI and clinic data of 14 patients with pigmented villonodular synovitis proved by pathology were reviewed retrospectively. Results MRI showed diffusible lesions in all 14 cases. 12 cases were located in knee joint, 2 in hip. MRI revealed nodules and masses formed by villis hyperplasia in the joints. MRI demonstrated the nodules with slightly low signal intensity on both TlWI and T2WI in 13 cases, the destruction of the cartilage in 8 cases, the destruction of the ligament in 5 cases, and the hydropsy in joint cavity in 10 cases, the destruction of the meniscus in 2 cases. Conclusion The typical features of pigmented villonodular synovitis on MRI revealed the nodules formed by villis hyperplasia in the joint. Hemosiderin in the nodules demonstrated slightly low signal intensity on both T1WI and T2WI, with the presence of typical features like ＂foam rubber cushion＂ sign and ＂lichen＂ sign.