CONGENITAL adrenal hyperplasia is characterized by virilism which may be associated with "salt-losing" or other features.1 Deficiency of either 21-hydroxylation or 11-hydroxylation in the adrenal cortex in the biosynthesis of cortisol usually is present in this disorder. Recently, patients exhibiting another enzymatic defect, 3-β-hydroxysteroid dehydrogenase deficiency have been described.2-5 This defect has been associated with profound adrenocortical insufficiency and salt loss, and most patients have died despite apparently adequate therapy. The diagnosis may be difficult since excretion of pregnanetriol, a substance characteristically present in abnormally large amounts in the urine in the more typical forms of congenital adrenal hyperplasia, is not increased in this form of hyperplasia.4 It is the purpose of this communication to present a patient who represents another example of this disorder. Report of a Case Baby F was the product of a normal, full term spontaneous delivery, having a birth weight of 9