title: Increased MRI volumetric correlation contralateral to seizure focus in temporal lobe epilepsy.
abstract: Quantification of volumetric correlation may be sensitive to disease alterations undetected by standard voxel based morphometry (VBM) such as subtle, synchronous alterations in regional volumes, and may provide complementary evidence of the structural impact of temporal lobe epilepsy (TLE) on the brain. The purpose of this study was to quantify differences of regional volumetric correlation in right (RTLE) and left (LTLE) TLE patients compared to healthy controls. A T1 weighted 3T MRI was acquired (1mm(3)) in 44 drug resistant unilateral TLE patients (n=26 RTLE, n=18 LTLE) and 44 individually age and gender matched healthy controls. Images were processed using a standard VBM framework and volumetric correlation was calculated across subjects in 90 regions and compared between patients and controls. Results were summarized across hemispheres and region groups. There was increased correlation involving the contralateral homologues of the seizure foci/network in the limbic, subcortical and temporal regions in both RTLE and LTLE. Outside these regions, results implied widespread correlated alterations across several contralateral lobes in LTLE, with more focal changes in RTLE. These findings complement previous volumetric studies in TLE describing more ipsilateral atrophy, by revealing subtle coordinated volumetric changes to identify a more widespread effect of TLE across the brain.
authors.affiliation: Vanderbilt University Institute of Imaging Science, Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA.
authors.forename: Benjamin N
authors.initials: BN
authors.lastname: Conrad
authors.affiliation: Vanderbilt University Institute of Imaging Science, Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA.
authors.forename: Baxter P
authors.initials: BP
authors.lastname: Rogers
authors.affiliation: Department of Neurology, Vanderbilt University, Nashville, TN, USA.
authors.forename: Bassel
authors.initials: B
authors.lastname: Abou-Khalil
authors.affiliation: Vanderbilt University Institute of Imaging Science, Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA. Electronic address: victoria.morgan@vanderbilt.edu.
authors.forename: Victoria L
authors.initials: VL
authors.lastname: Morgan
mesh_terms: D000328:Adult; D015331:Cohort Studies; D000069279:Drug Resistant Epilepsy / Q000000981:diagnostic imaging* / Q000503:physiopathology; D004833:Epilepsy, Temporal Lobe / Q000000981:diagnostic imaging* / Q000503:physiopathology; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009434:Neural Pathways / Q000000981:diagnostic imaging / Q000503:physiopathology; D009929:Organ Size; D012640:Seizures / Q000000981:diagnostic imaging* / Q000503:physiopathology
keywords: Epilepsy; Gray matter; MRI; Networks; Volumetric MRI