Figure 1.

Preoperative evaluation for epilepsy surgery.

a–b) Precise determination of the source of epileptic activity with multichannel surface EEG recording (256 EEG channels);

c–d) High-resolution magnetic resonance imaging revealing multiple lesions: intrasulcal left fronto-insular lipomas with associated focal cortical dysplasia; “pancake view” revealing migration abnormalities in a side-to-side comparison (in this case: right perisylvian polymicrogyria);

e) Stereo-EEG trajectories, in this case for the invasive evaluation of the epileptogenicity of a temporopolar encephalocele;

f) Subdural electrodes in the interhemispheric fissure and over the cerebral convexity for the precise definition of an epileptogenic area next to the primary motor cortex