Retroperitoneal xanthogranuloma and xanthosarcoma (malignant fibrous xanthoma).
D006099:Granuloma / Q000145:classification / Q000473:pathology*; D006644:Histiocytes; D006801:Humans; D002479:Inclusion Bodies; D008113:Liver Neoplasms / Q000473:pathology; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D009362:Neoplasm Metastasis; D012186:Retroperitoneal Neoplasms / Q000145:classification / Q000473:pathology; D012187:Retroperitoneal Space; D012509:Sarcoma / Q000145:classification