PMC5377006_01
Interictal EEG record: Common average referential montage at normal and slower paper speed (upper panel) shows left hemispheric poly spike and wave discharges along with the right hemisphere showing positivity at the onset; the bipolar montage (lower panel) shows more prominent anterior distribution especially frontocentral.
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An interictal EEG was initially performed which showed spike-and-wave discharges in the awake state distributed frontocentrally over the left hemisphere (Fig. 1).
Ictal EEG record showed a 4-5 Hz parasaggital rhythm; while a faster 9-10 Hz activity was seen in mid and posterior temporal region in the left hemisphere.
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A 9-10 Hz faster rhythm was also observed in the left mid and posterior temporal regions which did not show evolution (Fig. 2).