title: Retroperitoneal teratoma.
mesh_terms: D002675:Child, Preschool; D006801:Humans; D008297:Male; D011859:Radiography; D012186:Retroperitoneal Neoplasms / Q000000981:diagnostic imaging / Q000601:surgery*; D013724:Teratoma / Q000000981:diagnostic imaging / Q000601:surgery*