膝关节色素沉着绒毛结节性滑膜炎MRI表现

MRI manifestations of pigmented villonodular synovitis of the knee joint

目的:探讨膝关节色素沉着绒毛结节性滑膜炎(pigmented villonodular synovitis,PVNS)的MRI表现。方法:分析6例PVNS患者行MRI检查并经病理证实病例的MRI资料。结果:6例均为弥漫型PVNS,表现为不规则滑膜增厚及关节软骨的破坏,2例表现为关节腔积液,5例表现为关节滑膜呈不规则结节状增生,2例增强后病灶呈线状网格状强化,4例表现为骨质侵蚀破坏改变,1例表现为关节外侵犯。结论:MRI能准确反映PVNS中滑膜的绒毛结节状增生、增生滑膜及其对关节软骨的破坏以及增生滑膜对软骨下骨质及软骨下远部骨质侵蚀的不同时期绒毛结节的影像学特征,并可以准确评价病变对关节内外累及的范围,是诊断PVNS最佳检查方法。

Objective：To evaluate the value of MRI in diagnosing pigmented villonodular synovifis （PVNS）. Methods：The MRI of 6 pathologically proven eases of PVNS were retrospectively reviewed. Results：All 6 eases were diffuse form of PVNS. Typical MRI findings included variable extent of nodular synovial proliferation and articular cartilage erosion. Joint effusion presented in 2 eases, irregular and nodular synovial proliferation in 5 eases. 2 eases with linear or reticular enhancement, 4 eases with multiple bony erosions, while one patient with invasion of extra - articular structures. Conclusion： The feathers of nodular synovial proliferation, articular cartilage erosion, involement of subchondral bone, intra-and extra-articular invasion can all be detected presieely by MRI. MRI is the most valuable method for diagnosing PVNS.