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Brain Advance Access published online on November 24, 2004
Brain, doi:10.1093/brain/awh333
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Received July 2, 2004
Revised September 8, 2004
Accepted September 27, 2004

Article

Utilization of magnetoencephalography results to obtain favourable outcomes in epilepsy surgery

Michael J. M. Fischer 1, Gabriela Scheler 1, and Hermann Stefan 1*

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

* To whom correspondence should be addressed.
Hermann Stefan, E-mail: hermann.stefan{at}neuro.imed.uni-erlangen.de


  Abstract

Summary 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.

Keywords: MEG; presurgical evaluation; functional tailoring; MSI epilepsy surgery; epilepsy.
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