title: Benign synovioma (pigmented villonodular synovitis).
mesh_terms: D005870:Giant Cell Tumors / Q000473:pathology; D006801:Humans; D008654:Mesothelioma / Q000473:pathology; D013584:Sarcoma, Synovial / Q000473:pathology*; D013583:Synovial Membrane / Q000648:ultrastructure