Volume 105, Issue 3, Pages 337-348 (August 2013) Interictal MEG reveals focal cortical dysplasias: Special focus on patients with no visible MRI lesions  Juha Wilenius, Mordekhay Medvedovsky, Eija Gaily, Liisa Metsähonkala, Jyrki P. Mäkelä, Anders Paetau, Leena Valanne, Ritva Paetau  Epilepsy Research  Volume 105, Issue 3, Pages 337-348 (August 2013) DOI: 10.1016/j.eplepsyres.2013.02.023 Copyright © 2013 Elsevier B.V. Terms and Conditions

Fig. 1 (A) MEG spike sources of one patient plotted on a preoperative MRI. PCG marks the location of the post-central gyrus; SPS=spike sources.; (B) Histological sample of the resected tissue from the same patient. A gyrus and a narrow sulcus (to the left) can be seen in this section. Neuronal cytomegaly without balloon cells is evident, starting sparsely from the gyral top, and increasing towards the sulcal depth. This is a typical Palmini FCD 2A. Frozen section (intraoperative), toluidine blue, original magnification 100×. Epilepsy Research 2013 105, 337-348DOI: (10.1016/j.eplepsyres.2013.02.023) Copyright © 2013 Elsevier B.V. Terms and Conditions

Fig. 2 MEG dipole sources of interictal epileptiform activity plotted on post-operative MRI (Patient 5 on Table 2). Red dots mark a tight cluster of sources inside the resected area. Yellow dots show two sources separated from the tight cluster, but still considered to be part of it (according to the definition introduced in Methods). The green dot marks a single source considered as scatter. Lines indicate source orientations. (For interpretation of the references to color in the artwork, the reader is referred to the web version of the article.) Epilepsy Research 2013 105, 337-348DOI: (10.1016/j.eplepsyres.2013.02.023) Copyright © 2013 Elsevier B.V. Terms and Conditions