Benefit of corticosteroid therapy in Angelman syndrome.

Angelman syndrome is often associated with an intractable seizure disorder. We describe 4 children who demonstrated an excellent response to corticosteroid therapy. The benefits included not only reduction in clinical seizures but also modification of the "typical'' Angelman electroencephalogram. In addition, there was improvement in the myoclonic jerks, sleep pattern, and developmental progress. Corticosteroids appeared to have a broad benefit on the epileptic encephalopathy. We believe that these cases pose a challenge to the conventional management of intractable epilepsy in Angelman syndrome.