The document discusses disorders of sexual differentiation (DSD). It begins by describing typical embryonic development of male and female genitalia. Common causes of DSD are then discussed, including congenital adrenal hyperplasia (CAH), which can cause virilization of 46,XX individuals. Other conditions mentioned are ovotesticular DSD, complete and partial androgen insensitivity syndrome, 5-alpha reductase deficiency, persistent Müllerian duct syndrome, mixed gonadal dysgenesis, and complete gonadal dysgenesis. The roles of various genes in sexual development are also summarized. Clinical features, investigations, and management considerations are provided for different DSD conditions.