Female pseudohermaphrodites are genetic females who have ovaries but whose external genitalia are of a male type. The masculinization of the external genitalia occurs due to exposure to abnormally high levels of androgens. The commonest cause of female pseudohermaphroditism is congenital adrenal hyperplasia. This condition (also called adrerogenital syndrome) is characterized by the excessive production of androgens by the fetal suprarenal cortex. This results in masculinization of the external genitalia. Commonly there is enlargement of the clitoris, partial fusion of the labia majora, and a small persistent urogenital sinus. In some cases the masculinization may be so intense that the external genitalia are almost of a male type. Some cases of the female pseudohermaphroditism have been reported to be caused by the administration of androgenic agents to the pregnant women. Most of such cases have resulted from the use of certain virilizing progestins administered for the prevention of abortion.