Electroencephalography (EEG) remains an important complementary tool to diagnose neurologic diseases, including encephalitis. The objectives of this short review are to show the electroencephalographic findings in different types of encephalitis and to highlight the changing outlines during and after the specific treatment. In our study, we did a non-systematic review of literature on the role of EEG in infectious and autoimmune encephalitis. We concluded that EEG can be very useful in the diagnosis and follow-up of different types of encephalitis. Early changes during the illness can have an impact on prognosis.

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