title: Retroperitoneal mass in a 58-year-old man.
mesh_terms: D002822:Choriocarcinoma / Q000473:pathology; D004407:Dysgerminoma / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology* / Q000556:secondary; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis / Q000473:pathology*; D013736:Testicular Neoplasms / Q000473:pathology