Structural changes in the temporal lobe and piriform cortex in frontal lobe epilepsy
Centeno, Maria (Hospital Universitari Vall d'Hebron)
Vollmar, Christian (Universität München)
Stretton, J. (UCL Institute of Neurology (Regne Unit). Department of Clinical and Experimental Epilepsy)
Symms, M. R. (UCL Institute of Neurology (Regne Unit). Department of Clinical and Experimental Epilepsy)
Thompson, P. J. (UCL Institute of Neurology (Regne Unit). Department of Clinical and Experimental Epilepsy)
Richardson, M. P. (King's College London. Department of Clinical Neuroscience)
O'Muircheartaigh, J. (King's College London. Department of Clinical Neuroscience)
Duncan, John S (UCL Institute of Neurology (Regne Unit). Department of Clinical and Experimental Epilepsy)
Koepp, M. J. (UCL Institute of Neurology (Regne Unit). Department of Clinical and Experimental Epilepsy)
Universitat Autònoma de Barcelona

Date:	2014
Abstract:	Neuronal networks involved in seizure generation, maintenance and spread of epileptic activity comprise cortico-subcortical circuits. Although epileptic foci vary in location across focal epilepsy syndromes, there is evidence for common structures in the epileptogenic networks. We recently reported evidence from functional neuroimaging for a unique area in the piriform cortex, common to focal epilepsies in humans, which might play a role in modulating seizure activity. In this study, we aimed to identify common areas of structural abnormalities in patients with frontal lobe epilepsy (FLE). T1-weighted MRI scans of 43 FLE patients and 25 healthy controls were analysed using voxel based morphometry. Differences in regional grey matter volume were examined across the whole brain, and correlated with age at epilepsy onset, duration and frequency of seizures. We detected areas of increased grey matter volume in the piriform cortex, amygdala and parahippocampal gyrus bilaterally, as well as left mid temporal gyrus of patients relative to controls, which did not correlate with any of the clinical variables tested. No common areas of atrophy were detected across the FLE group. Structural abnormalities within the piriform cortex and adjacent structures of patients with FLE provide further evidence for the involvement of this area in the epileptogenic network of focal epilepsies. Lack of correlation with duration or age of onset of epilepsy suggests that this area of abnormality is not a consequence of seizure activity.
Note:	This work was undertaken as part of UniversitatAutonoma of Barcelona postgraduate program-Programa dedoctorado. Medicine department
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Frontal lobe epilepsy ; Piriform cortex ; Voxel based morphometry ; MRI
Published in:	Epilepsy Research, Vol. 108 (july 2014) , p. 978-981, ISSN 1872-6844

DOI: 10.1016/j.eplepsyres.2014.03.001
PMID: 24726451

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