Intractable neonatal seizures: an unusual presentation of congenital hypothyroidism.

Congenital hypothyroidism is the most common treatable cause of mental retardation. We report an unusual case of congenital hypothyroidism presenting as intractable seizures in an infant delivered to a mother known to have autoimmune hypothyroidism and who was noncompliant with therapy. To our knowledge, this rare presentation of congenital hypothyroidism has not been reported previously.