Familial white matter hypoplasia, agenesis of the corpus callosum, mental retardation and growth deficiency: a new distinctive syndrome.

We have observed in two different families two pairs of male siblings born from normal, non-consanguineous parents having the same syndrome, characterized by severe cerebral white matter hypoplasia, agenesis or extreme hypoplasia of the corpus callosum, mental retardation, failure to thrive and minor midline facial abnormalities. This seems to be a previously unreported genetic syndrome.