Conclusion: Irregular nodular synovial proliferation and hemosiderin deposition are the two main features of pigmented villonodular synovitis, based on which MRI diagnosis can be made.

• 结论：PVNS所致的滑膜增生和含铁血黄素沉着在MRI上具有特征性的表现和信号，对诊断本病具有重要意义。