title: Undescended testis: a dual lesson.
mesh_terms: D000293:Adolescent; D003456:Cryptorchidism / Q000000981:diagnostic imaging / Q000235:genetics*; D004200:Diseases in Twins; D006801:Humans; D008297:Male; D010690:Phlebography; D013737:Testis / Q000000981:diagnostic imaging