The XY female and SWYER syndrome.

SWYER syndrome or pure gonadal dysgenesis is a disease in which individuals with a female phenotype, with female external genital organs, have a 46 XY karyotype and streak gonads that ought to be removed given their high malignization potential. We present the case of a patient with Swyer syndrome, and compare them with other cases of patients with a 46 XY karyotype, phenotypically female, such as in Congenital Adrenal Hyperplasia from deficiency of the 17 α hydroxylase/17-20 Lyase enzyme and in the Congenital Androgenic Insensitivity Syndrome.