Congenital adrenal hyperplasia due to 3-beta-hydroxysteroid dehydrogenase deficiency is a very rare form of congenital adrenal hyperplasia (CAH) encompassing salt-wasting and non-salt wasting forms with a wide variety of symptoms, including glucocorticoid deficiency and male undervirilization manifesting as a micropenis to severe perineoscrotal hypospadias. The disease is Monarch Disease Ontology identifier MONDO_0008727 (congenital adrenal hyperplasia due to 3-beta-hydroxysteroid dehydrogenase deficiency). Also known as: 3-beta HSD deficiency, CAH due to 3-beta-hydroxysteroid dehydrogenase deficiency.