Sporadic case of apparent aprosencephaly.

We report a sporadic case of apparent aprosencephaly, ie, apparent absence of forebrain with the facial anomalies of the (alobar) holoprosencephaly field complex. The infant lived-14 months, manifested temperature variations between 34.5 and 41.7 degrees C, and suffered at least one episode of severe hyponatremia suggesting hypoaldosteronism of brain or adrenal origin. Eye changes were suggestive of Rieger mesodermal dysgenesis.