Abstract
A 2-year-old girl presented with brief episodes of left hemifacial twitching. On ictal electroencephalography, repetitive focal spike discharges appeared at the right fronto-centro-temporal regions; these discharges preceded the onset of each twitch by 12ms. Magnetic resonance imaging showed a linear abnormal signal intensity in the subcortical white matter at the right postcentral gyrus, where a cluster of dipole sources was detected by magnetoencephalography. These findings suggested that the patient had focal cortical myoclonus due to rolandic focal cortical dysplasia.
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