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| Synovitis, Pigmented Villonodular Pigmented Villonodular Synovitides | Pigmented Villonodular Synovitis | Synovitides, Pigmented Villonodular | Villonodular Synovitides, Pigmented | Villonodular Synovitis, Pigmented Outgrowths of synovial membrane composed of villi and fibrous nodules characterized histologically by hemosiderin- and lipid-containing macrophages and multinucleated giant cells. It usually occurs in the knee. |