The electroencephalogram was normal in over 50% of 11 patients with normal pressure hydrocephalus. When present, abnormal records had a variety of changes, usually seen against normal background rhythms. Third ventricular dilatation, by itself, is not a cause of bursts or projected rhythms in the EEG.
Brown DG, Goldensohn ES. The Electroencephalogram in Normal Pressure Hydrocephalus. Arch Neurol. 1973;29(1):70–71. doi:10.1001/archneur.1973.00490250088014
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