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October 25, 2011
Scalp EEG recordings from temporal lobe epilepsy patients with unilateral hippocampal sclerosis may rarely demonstrate the majority of seizures appearing to originate over the contralateral temporal lobe. Termed "burned-out hippocampus" syndrome, this generally occurs in the setting of a severely atrophic hippocampus. A proposed explanation is that the extensive atrophy precludes sufficient ipsilateral neocortical recruitment to generate a surface discharge prior to seizure propagation (probably via the dorsal hippocampal commissure) into the contralateral temporal lobe. This is supported by invasive depth electrode recordings which have demonstrated mesial temporal lobe seizure onset ipsilateral to the atrophic hippocampus.
Submitted by: Indranil Sen-Gupta, MD
Disclosures: Dr. Sen-Gupta reports no disclosures.
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