[Persistence of the oviduct (pseudohermaphroditismus masculinus internus)]

Internal male pseudohermaphroditism is a rare malformation. Its reason is the lack of the Müllerian inhibiting substance produced by the fetal Sertoli cells. Therefore, additional female genital organs exist in a normal male. Genetic determination seems to be possible. Early correction of cryptorch testes is the therapy of choice and promises fertility for some patients.