[Partial status epilepticus developed 41 years after psychosurgery--an electroencephalographic and neuropathological study].

The authors report an 85-year-old man with schizophrenia, who had undergone bilateral frontal gyrectomy at the age of 44 and had a single series of convulsions 6 months after the psychosurgery. Forty-one years later, he had developed partial seizures with secondary generalized seizures, and died of partial status epilepticus. Ictal EEG showed generalized high-amplitude spikes or sharp waves spreading from the left frontal region. Interictal EEG showed slowing of background activity and high-amplitude paroxysmal discharges on the left frontal and central regions. Postmortem examination of the brain revealed tissue defects in the superior and middle frontal gyri caused by resection at the time of gyrectory and old cysts in the deep frontal white matter as late sequelae of the psychosurgery. There was fibrillary gliosis in the surrounding cerebral convolutions and the deep white matter. We considered that the glial scar in the frontal lobes, on the left side in particular, had developed the epileptogenic focus. The pathophysiological mechanism by which the intractable epileptic seizures appeared 41 years after psychosurgery is discussed.