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The patient was the fourth of affected male siblings. Cortisol (1.3 micrograms per cent), cortisone (9.6), and corticosterone sulfate (0.1) concentrations were low in cord blood. The larger amount of cortisone may have originated from maternal cortisol. Aldosterone was undetectable in cord blood, indicating lack of fetal secretion or maternofetal transfer. Unexpectedly normal concentrations of 11-deoxycorticosterone (DOC) sulfate in cord serum could represent maternal transfer of DOC, with subsequent fetal sulfurylation. Low estrone and estradiol concentrations in maternal and cord serum were consistent with absence of the fetal adrenals. Despite the low levels of the steroids, the propositus had a normal lecithin-sphingomyelin ratio at 38 weeks' gestation. Circulatory insufficiency developed within half an hour after birth and responded to gluco- and mineralocorticoid therapy. The three untreated siblings died between 14 and 67 hours of age. It is evident that early recognition of this condition may be lifesaving.