title: Undescended testis.
mesh_terms: D000328:Adult; D002648:Child; D002675:Child, Preschool; D003456:Cryptorchidism / Q000209:etiology / Q000601:surgery; D005298:Fertility; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D013736:Testicular Neoplasms / Q000209:etiology