"C" trigonocephaly syndrome: report of a child with agenesis of the corpus callosum and tetralogy of Fallot, and review.

We report on a new case of the Opitz "C" trigonocephaly syndrome. Our patient had agenesis of the corpus callosum, an anomaly seen only twice previously, and tetralogy of Fallot, described only once before. A review shows that a combination of conotruncal heart defects and midline brain anomalies characterizes patients with this entity.