title: Retroperitoneal varices simulating masses.
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008875:Middle Aged; D012186:Retroperitoneal Neoplasms / Q000000981:diagnostic imaging*; D012187:Retroperitoneal Space / Q000098:blood supply*; D014057:Tomography, X-Ray Computed; D014648:Varicose Veins / Q000000981:diagnostic imaging*