title: Pigmented villonodular synovitis presenting as a popliteal cyst.
mesh_terms: D006801:Humans; D007717:Knee / Q000000981:diagnostic imaging; D007719:Knee Joint; D008297:Male; D008875:Middle Aged; D011859:Radiography; D000074402:Synovectomy; D013581:Synovial Cyst / Q000150:complications* / Q000601:surgery; D013585:Synovitis / Q000150:complications* / Q000601:surgery