False lateralization on scalp EEG on mesial temporal epilepsy due to hippocampal sclerosis – cases report <b>[Abstract in English]</b>

Abstract

Objective: To describe 3 cases in which the initial investigation did not confirm the laterality of the seizures, illustrating the false lateralization on scalp EEG on TLE/HS.
Commentaries: Since the discharges of the HS are originated from the deep brain, it would spread to the contralateral side before get surface. However, the long-term stimulation of the contralateral lobe would cause lesion on this side, and seizures are triggered independently (secondary epileptogenesis). In this case, the surgery approach is not indicated. The invasive investigation, by subdural strips and video-EEG monitoring, in cases of discordance of scalp EEG and MRI, are better for the surgery indication for TLE/HS, once the operatory results in case of bilateral focus could be catastrophic.
KEY WORDS: FALSE LATERALIZATION/scalp EEG; TEMPORAL LOBE EPILEPSY/hippocampal sclerosis.