The undescended testis.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003456:Cryptorchidism / Q000150:complications / Q000175:diagnosis / Q000628:therapy; D005837:Genitalia, Male / Q000196:embryology / Q000601:surgery; D006552:Hernia, Inguinal / Q000150:complications; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male