PT  - JOURNAL ARTICLE
AU  - Xavier De Tiège
AU  - Evelien Carrette
AU  - Benjamin Legros
AU  - Kristl Vonck
AU  - Marc Op de beeck
AU  - Mathieu Bourguignon
AU  - Nicolas Massager
AU  - Philippe David
AU  - Dirk Van Roost
AU  - Alfred Meurs
AU  - Samuel Lapere
AU  - Karel Deblaere
AU  - Serge Goldman
AU  - Paul Boon
AU  - Patrick Van Bogaert
TI  - Clinical added value of magnetic source imaging in the presurgical evaluation of refractory focal epilepsy
AID  - 10.1136/jnnp-2011-301166
DP  - 2012 Apr 01
TA  - Journal of Neurology, Neurosurgery & Psychiatry
PG  - 417--423
VI  - 83
IP  - 4
4099  - http://jnnp.bmj.com/content/83/4/417.short
4100  - http://jnnp.bmj.com/content/83/4/417.full
SO  - J Neurol Neurosurg Psychiatry2012 Apr 01; 83
AB  - Objective This prospective, bicentre, blinded, intention to treat study assessed the clinical added value of magnetic source imaging (MSI) in the presurgical evaluation of patients with refractory focal epilepsy (RFE).Methods 70 consecutive patients with RFE (42 men; mean age 31.5 years, range 3–63) from two Belgian centres were prospectively included. All patients underwent conventional non-invasive presurgical evaluation (CNIPE) and a whole head magnetoencephalography recording (Elekta Neuromag). Equivalent current dipoles corresponding to interictal epileptiform discharges (IED) were fitted in the patients' spherical head model and coregistered on their MRI to produce MSI results. Results of CNIPE were first discussed blinded to the MSI results in respective multidisciplinary epilepsy surgery meetings to determine the presumed localisation of the epileptogenic zone and to set surgical or additional presurgical plans. MSI results were then discussed multidisciplinarily. MSI influence on the initial management plan was assessed.Results Based on CNIPE, 21 patients had presumed extratemporal epilepsy, 38 had presumed temporal epilepsy and 11 had undetermined localisation epilepsy. MSI showed IED in 52 patients (74.5%) and changed the initial management in 15 patients (21%). MSI related changes were significantly more frequent in patients with presumed extratemporal or undetermined localisation epilepsy compared with patients with presumed temporal epilepsy (p≤0.001). These changes had a clear impact on clinical management in 13% of all patients.Conclusion MSI is a clinically relevant, non-invasive neuroimaging technique for the presurgical evaluation of patients with refractory focal epilepsy and, particularly, in patients with presumed extratemporal and undetermined localisation epilepsy.