[Electroencephalographic signs of a pathologic process in the area of the cerebellopontine angle]

Electroencephalographic examination of patients with giant neurinomas of the auditory nerve treated with diazepam and sombrevin in the preoperative period was effective in specifying definite signs, making it possible, on the basis of the EEG findings, to localize the pathological process at the level of the posterior cranial fossa and to establish its predominant impact on the structures of the posterior cranial fossa. The electroencephalographic data obtained from these patients under electrophysiological control during surgery correlated with the changes in the EEG pattern found in the preoperative period. As a result of the examination carried out, a totality of indices were specified, enabling the localization of the pathological process at the level of the posterior cranial fossa.