Lennox–Gastaut syndrome after a further attenuated live measles vaccination

We reported a 2-year-old boy with Lennox–Gastaut syndrome, of which the cause could be an adverse effect of further attenuated live (FL) measles vaccine. The pre- and peri-natal histories of the patient were uneventful, except that he was one of monozygotic twins. He had developed normally until 24 months of life, when tonic seizures began on postvaccination day 14 without a preceding episode of continuous fever or any neurologic symptoms. The tonic seizures and atypical absence have been intractable as to various antiepileptic drugs, while his twin brother has experienced no epileptic seizures.