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Brain Advance Access originally published online on November 24, 2004
Brain 2005 128(1):153-157; doi:10.1093/brain/awh333
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Brain Vol. 128 No. 1 © Guarantors of Brain 2004; all rights reserved

Utilization of magnetoencephalography results to obtain favourable outcomes in epilepsy surgery

Michael J. M. Fischer, Gabriela Scheler and Hermann Stefan

Department of Neurology, Epilepsy-Neurocentre, University of Erlangen-Nuremberg, Erlangen, Germany

Correspondence to: Professor Dr Hermann Stefan, Department of Neurology, University of Erlangen-Nürnberg, Schwabachanlage 16, D-91054 Erlangen, Germany E-mail: hermann.stefan{at}neuro.imed.uni-erlangen.de

Magnetoencephalography (MEG) is a well-known technique in the presurgical evaluation of epilepsy patients. Like EEG, it can detect and localize epileptic activity. Epilepsy surgery can be used to evaluate MEG source localizations. Resection volumes were determined in 33 epilepsy surgery patients. The resection volume, taken together with the post-operative outcome, was used to evaluate MEG results. The scattering MEG localizations of interictal epileptic activity were represented by an ellipsoidal volume. Using this MEG results ellipsoid, it was demonstrated that a high coverage by the resection volume and a small distance to the resection volume are both correlated to a favourable outcome; in addition, a homogeneous distribution of MEG localizations is correlated to a favourable outcome. This study shows that MEG source localization can help to delineate epileptic activity and, along with other techniques, should be taken into account for epilepsy surgery.


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