Abstract
Epilepsy surgery is basically composed of two methods, resection and disconnection. Disconnection surgery involves corpus callosotomy, multiple subpial transection (MST), and hemispherotomy (modified functionalhemispherectomy). Corpus callosotomy is very effective for drop attacks which often accompany bilateral synchronous spike and waves on EEG. Although improvement of cognition is frequently observed after surgery in children, disturbance of psychosocial adjustment is not rare in adult. MST was originally developed for the treatment of epileptic foci in unresectable cortical areas. This technique is also instrumental in treating disseminated extensive epileptic foci. During surgery, repeated electrocorticography is essential to obtain satisfactory surgical results. Postoperative neurological deficits are rarely encountered after this procedure.
