• Benign epilepsy;
  • Neurons;
  • Neuroembryology;
  • Rolandic operculum;
  • Cerebral cortex

Summary: Five patients with treatable partial epilepsy and unilateral opercular neuronal migration disorder (NMD) are reported. Outcome was considered favorable when seizure control was prompt and complete with appropriate antiepileptic drug (AED) therapy, and when there was no relapse after AED discontinuation. Minor cortical sensorimotor defects were noted in 4 patients. All had normal mental status. No epileptic discharges were observed in the EEG of 4 patients, but rolandic spikes were observed in 1. The electroclinical and evolutive features suggested partial idiopathic epilepsy in 2 patients. Cases with focal neuronal migration disorders and favorable epilepsy outcome are probably more common than has been reported previously. The extent and location of the underlying microscopic lesions associated with the radiologically detectable cortical dysplasia may influence clinical outcome.