title: Central chondrosarcoma.
mesh_terms: D001859:Bone Neoplasms / Q000000981:diagnostic imaging*; D002813:Chondrosarcoma / Q000145:classification / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D007717:Knee; D008297:Male; D008875:Middle Aged; D011859:Radiography