Real-time ultrasonography of pelvic organs is a useful tool in diagnosing disorders in sexual development. US has proved to be rapid, accurate, non invasive method to visualize normal and pathologic pelvic structures and its role in intersex disorders lies in the capacity of demonstrate the anatomy of the genital and urinary tracts. The sonographic finding of feminine internal genitalia and bilateral enlargement of the adrenal glands in a newborn is suggestive for congenital adrenal hyperplasia (CAH) and allows to prevent the symptoms of a salt-losing syndrome.