[Immunologic aspects of transitory neonatal hyperthyroidism]

The pathogenesis of neonatal transient hyperthyroidism has not been fully established, but the placental transfer of thyroid stimulating immunoglobulins such as thyroid stimulating antibodies is considered the main cause. Clinical signs usually subside with the disappearance of thyroid-stimulating IgG in the serum of the neonate. We report the clinical course of a neonatal transient hyperthyroidism.