A Single Tight MEG Cluster may only represent a Fragment of Type I FCD

Magnetoencephalography (MEG) is a non-invasive diagnostic tool for presurgical evaluation of patients with refractory epilepsies. It has been reported that a tight MEG cluster is an indicator for focal epilepsy and good surgical outcome; when presented with a single tight MEG cluster, the patient is usually regarded as a good surgical candidate (Oishi et al., 2006). The experience at our institution mirrors the findings in the literature; resection of the MEG cluster positively associates with seizure outcome (Schneider et al., 2012), especially in extratemporal lobe cases (Vadera et al., 2013); we have also demonstrated the value of MEG when used in combination with SPECT and ICEEG (Schneider et al., 2013).

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