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Review
. 2020 Nov;37(6):518-536.
doi: 10.1097/WNP.0000000000000484.

Normal Variants in Magnetoencephalography

Stefan Rampp  1   2 , Yosuke Kakisaka  3 , Sumiya Shibata  4 , Xingtong Wu  1   5 , Karl Rössler  1 , Michael Buchfelder  1 , Richard C Burgess  6
Affiliations
Review

Normal Variants in Magnetoencephalography

Stefan Rampp et al. J Clin Neurophysiol. 2020 Nov.

Abstract

Normal variants, although not occurring frequently, may appear similar to epileptic activity. Misinterpretation may lead to false diagnoses. In the context of presurgical evaluation, normal variants may lead to mislocalizations with severe impact on the viability and success of surgical therapy. While the different variants are well known in EEG, little has been published in regard to their appearance in magnetoencephalography. Furthermore, there are some magnetoencephalography normal variants that have no counterparts in EEG. This article reviews benign epileptiform variants and provides examples in EEG and magnetoencephalography. In addition, the potential of oscillatory configurations in different frequency bands to appear as epileptic activity is discussed.

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