title: Malignant fibrous xanthoma of retroperitioneum.
mesh_terms: D000368:Aged; D003593:Cytoplasm; D005350:Fibroma / Q000175:diagnosis* / Q000473:pathology; D006644:Histiocytes; D006801:Humans; D007672:Kidney Cortex / Q000473:pathology; D008297:Male; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis* / Q000473:pathology