Antecollis and levodopa-responsive parkinsonism are late features of Dravet syndrome

Dravet syndrome (DS) is a severe genetic epileptic encephalopathy mainly caused by SCN1A mutations.(1) Children usually develop frequent and pharmacoresistant seizures of several types. Besides cognitive delay, some patients later develop gait ataxia. “Crouch gait” has also been described in older patients.(2,3)