Topography of foramen ovale electrodes by 3D image reconstruction

To date, the foramen ovale (FO) electrode recording technique has been used in 234 patients at our center to assist in the evaluation of epilepsy surg ery. Most of the patients suffered from mesial temporal lobe epilepsy (MTLE ) and were candidates for a selective amygdalohippocampectomy. Knowledge of the exact topography of the FO electrodes is mandatory for a more precise anatomo-electro-clinical correlation of seizures and for a better understan ding of FO electrode recorded electroencephalogram (EEG) and evoked potenti als generated in the hippocampal formation or in nearby thalamic relays or brainstem structures. Here, we describe and illustrate a 3D image reconstru ction of FO electrodes in situ as an important step to better define the ge nerators of MTLE seizures as well as of interictal spikes and physiological EEG signals recorded with FO electrodes. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.