title: Massive retroperitoneal tumor in a 40-year-old man.
mesh_terms: D000328:Adult; D004407:Dysgerminoma / Q000175:diagnosis* / Q000556:secondary; D006801:Humans; D008297:Male; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis* / Q000556:secondary; D013736:Testicular Neoplasms