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The EEG in deep midline lesions

From the Departments of Neurology and Neurosurgery, McGill University and the Montreal Neurological Institute (Drs. Gloor and Gotman), Montreal, Quebec, and the Department of Neurology, Hahnemann Medical College and Hospital (Dr. Schaul), Philadelphia, PA.

we studied the electroencephalograms (EEGs) of 154 patients with well-defined diencephalic, mesencephalic, or posterior fossa lesions. Electrographic and clinical parameters were statistically evaluated. The results indicated considerable overlap of EEG abnormalities from different subcortical sites. Focal or lateralized abnormalities were relatively specific, suggesting a diencephalic lesion, whereas bilateral paroxysmal slow-wave disturbances were unspecific and not of precise diagnostic significance. There was no specific feature in this series to clearly distinguish the EEG pattern in deep midline lesions from that seen with diffuse cortical and subcortical encephalopathies.

Address correspondence and reprint requests to Dr. Schaul, Department of Neurology, Hahnemann Medical College and Hospital, 230 North Broad Street, Philadelphia, PA 19102.

Accepted for publication April 15, 1980.

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