JLE

Epileptic Disorders

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In the pursuit of the epileptogenic zone – listen carefully and look deeply Volume 23, numéro 4, August 2021

Figure 1

MEG and SEEG data. MEG shows a primary dipole cluster in the mid (A) to posterior (B) right superior temporal sulcus. Brain MRI/reconstruction (C-F) shows the scheme of depth electrodes; selected electrodes are labeled. Pink depth electrode (D-F) represents RHP.

Figure 2

Interictal and ictal SEEG. Upper panel: interictal bipolar montage showing RHP:1-3 spiking (red box) at 2-3 Hz. Middle and lower panels: ictal bipolar montage showing low-voltage fast activity at RHP:1-2 (onset at red arrow, evolution at purple arrow). Sensitivity: 75 uV/mm; LF: 0.5-1 Hz; HFF: 600 Hz.

Figure 3

(A, B) Intraoperative images prior to (A) and after (B) resection; depth electrode RHP entry point is indicated by the star. Middle panel: Ictal ECoG prior to resection shows repetitive spiking at electrodes 12-17 and 8-9, and less prominently at 10-11. Lower panel: ECoG following resection without any epileptiform abnormalities. Note that the temporo-occipital-parietal junction was not entirely sampled on ECoG. STG: superior temporal gyrus; SF: Sylvian fissure; IPL: inferior parietal lobule; ANT: anterior; POST: posterior.