Correspondence between scalp-EEG and SEEG seizure onset patterns in patients with MRI-negative drug-resistant focal epilepsy.

In patients with MRI-negative focal epilepsies, scalp SOP could suggest the SEEG SOP and some aetiology (focal cortical dysplasia) but has no correlation with surgical prognosis. Scalp SOP correlates with the SEEG SOP in cases of simultaneous EEG and clinical onset, otherwise scalp SOP reflects the propagation of the SEEG discharge.