Abstract
The 17-oxogenic steroid excretion of women pregnant with an anencephalic foetus was found to be significantly lower than that of women pregnant with a normal foetus but similar to that of non-pregnant women taking oral contraceptives containing oestrogens. It is suggested that the diminished excretion of 17-oxogenic steroids in pregnancies with an anencephalic foetus may reflect defective production of corticosteroids or their precursors by the abnormal adrenal of the anencephalic foetus.

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