Selection criteria for surgery--clinical features and EEG including invasive techniques.

Preconditions, selection criteria for surgical treatment of epilepsy and some aspects of the presurgical evaluation are discussed. Identification of those patients who will profit from epilepsy surgery, exact localization of the seizure generating structures, and evaluation of the potential risks of the proposed operation are the main goals of the preoperative diagnostic procedures. The localizational value of certain seizure patterns and ictal clinical signs and symptoms is reviewed and illustrated with symptoms provoked by electrical stimulation of the brain.