[Electroencephalogram findings in lesionectomies: preliminary results]

Use of the electrocorticogram (EcoG) in planning lesionectomies is a controversial subject at present.

We describe a series of 5 patients with epileptic crises, 3 with arteriovenous malformations in whom the lesion was completely resected, followed by postoperative angiography, and two with gliomas with low grade malignancy in whom iridium 192 was implanted.

1. The most frequent reason for consultation was convulsions. 2. In our series of patients the commonest site was the frontal zone of the right hemisphere. 3. Potentials with epileptiform characteristics were registered at the edges of the lesions and occasionally over the lesion itself. In two cases electro-clinical crises were seen. 4. The lesions were resected from normal tissue independently of the EcoG results.

Although they are preliminary findings, the results of the study support the usefulness of this technique to guide the surgical procedures used for the treatment of intractable epilepsy.