[EEG in non-traumatic subdural hematoma]

Clinical and EEG data in 44 adult cases of non-traumatic subdural hematoma are reported. Tracings are analysed with reference to consciousness, revealing some very suggestive electrographic aspects. A normal EEG does not rule out the diagnosis. Correct lateralization was established by the EEG in 84% of the cases and there was no incorrect lateralization. Heterolateral suffering reported in the literature must correspond to associated traumatic lesions. Two alpha-type coma tracings, of which one was distinctly asymmetrical, and two tracings comprising generalized paroxysms of triphasic waves are reported.