title: Perirenal localized form of retroperitoneal fibrosis.
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D007680:Kidney Neoplasms / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012185:Retroperitoneal Fibrosis / Q000000981:diagnostic imaging* / Q000473:pathology