GAPO syndrome: a report of two siblings and a review of literature.

Growth retardation, alopecia, pseudoanodontia, optic atrophy (GAPO) syndrome is a rare autosomal recessive disorder. The molecular nature of the disease is not fully understood and is considered to be one of the ectodermal dysplasia defects. In this report, we describe clinical, histologic, and ultrastructural features in two siblings born to consanguineous parents with a brief review of the literature.