We present a child with myoclonic seizures, epileptic spasms and generalized epileptiform discharges on scalp EEG. Magnetoencephalography and coherence-phase analysis for scalp EEG suggested focal onset in the left hemisphere. Intracranial video EEG confirmed seizure onset in the left frontal lobe with ictal high-frequency oscillations. Left frontal lobectomy suppressed his seizures. Subsets of myoclonic seizures can be focal in origin despite bilaterally synchronized epileptiform discharges on scalp EEG.
- Coherence-phase analysis
- Ictal high frequency oscillations
- Intracranial video EEG
- Myoclonic seizures
- Secondary bilateral synchrony
ASJC Scopus subject areas
- Clinical Neurology