title: Retroperitoneal fibroxanthosarcoma: report of a case.
mesh_terms: D005354:Fibrosarcoma / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D007866:Leg; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D009133:Muscular Atrophy / Q000209:etiology; D011859:Radiography; D011879:Radiotherapy Dosage; D012186:Retroperitoneal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D013125:Spinal Neoplasms / Q000000981:diagnostic imaging