Single stage epilepsy surgery in children and adolescents with focal cortical dysplasia type II - Prognostic value of the intraoperative electrocorticogram.

•Prospective study evaluating the significance of epileptic activity in ECoGs in children.•Relationship between fast activity recorded in the ECoGs and unfavourable seizure outcomes.•Fast activity recorded with a relatively simple ECoG-equipment might be an alternative to high-frequency oscillations.