title: Case records of the Massachusetts General Hospital. Weekly clinicopathological exercises. Case 45-1991. An 84-year-old man with a slowly enlarging mass in the left popliteal space.
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002813:Chondrosarcoma / Q000473:pathology*; D003937:Diagnosis, Differential; D006801:Humans; D007592:Joint Diseases / Q000473:pathology; D007719:Knee Joint; D008297:Male; D013584:Sarcoma, Synovial / Q000175:diagnosis; D013583:Synovial Membrane / Q000473:pathology