UBDURAL electrodes are widely utilized to gather EEG data from cortical areas to localize seizure foci before resection. 1,4,7 Seizure disorders can be associated with the presence of arachnoid cysts, 5 and the question of seizure generation from the cortical surface in the depths of the cyst often arises. The technical issue relates to the tendency of electrode arrays to slide off concave areas of the cortex and thus provide confounding EEG data. We report on a technique for placing a subdural

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... electrode grid into the depths of arachnoid cysts in two patients, which allowed successful localization of seizure foci in both cases. KEY WORDS • arachnoid cyst • intractable epilepsy • subdural electrode • seizure surgery 1 Abbreviations used in this paper: CSF = cerebrospinal fluid; CT = computed tomography; EEG = electroencephalography. S Unauthenticated | Downloaded 07/09/20 05:21 AM UTC