SURGERY FOR CENTRAL, PARIETAL AND OCCIPITAL EPILEPSY

Patients with epileptogenic lesions that are more or less restricted to the central, parietal or occipital regions represent 14% of our total epilepsy surgery series and consisted of 322 patients at the end of 1980. Tumoral or major vascular lesions were present in 117 patients (37%), but this report is limited to the remaining 203 patients (63%) with non-tumoral epileptogenic lesions. The presumed etiology was birth trauma or anoxia in 25%, postnatal brain trauma in 25%, and unknown in 24%, miscellaneous lesions were present in 16%, post-inflammatory gliosis or multiple factors were present in the remaining 10%. Follow-up data of 2-51 years' duration (median 18 years) are available for 186 of these 203 patients. Sixty-three patients (34%) remain seizure-free. Forty-two patients (23%) have a marked reduction of seizures. The remaining 81 patients (44%) have a lesser reduction. The variation in clinical seizure patterns is considerably greater than in temporal lobe epilepsy. Focal sensorimotor phenomena are common at the onset, whether the seizures begin in the central region or further posterior. The success following cortical resection is equally gratifying and the failures just as distressing as in surgery for epilepsy involving other brain regions.