our study led to 3 important etiological conclusions : 1 ) cases of undescended testes at birth and true undescended testes cases may represent somewhat different nosological entities , 2 ) unilateral and bilateral cases do not show any significant difference in epidemiological parameters and 3 ) the pituitary and chorionic gonadotrophins may have an important role in the occurrence of true undescended testes , as suggested by the season of birth .
C0018062
chorionic gonadotrophins
C0010417
undescended testes