Familial microcephaly with normal intelligence, immunodeficiency, and risk for lymphoreticular malignancies: a new autosomal recessive disorder.

We describe nine patients with an apparently new genetic disorder characterized by: microcephaly with normal intelligence; "bird"-like facial appearance; cellular and humoral immune defects; and increased risk for lymphoreticular malignancies. The postmortem findings of five patients are described. Chromosome instability appears not to be a component of the disorder. The occurrence in three pairs of sibs and isonomy in another family suggests autosomal recessive inheritance.