obsolete 46,XY disorder of sex development due to isolated 17,20-lyase deficiency https://github.com/monarch-initiative/mondo/issues/5114 https://github.com/monarch-initiative/mondo/issues/6651 https://github.com/monarch-initiative/mondo/issues/6750 https://github.com/monarch-initiative/mondo/issues/6753 https://github.com/monarch-initiative/mondo/issues/6876 https://github.com/monarch-initiative/mondo/issues/6877 https://github.com/monarch-initiative/mondo/issues/7693 true OBSOLETE. 46,XY disorder of sex development due to isolated 17,20-lyase deficiency is a rare disorder of sex development due to reduced 17,20-lyase activity that affects individuals with 46,XY karyotype and is characterized by ambiguous external genitalia, including micropenis, perineal hypospadias, bifid scrotum, cryptorchidism, and a blind vaginal pouch. Blood pressure and electrolytes are normal whilst hormonal investigations show normal basal and stimulated levels of cortisol, and low basal and stimulated androgen levels. MONDO:0019597 17,20-lyase deficiency, isolated