alexa Regional neocortical thinning in mesial temporal lobe epilepsy.
Neurology

Neurology

International Journal of Neurorehabilitation

Author(s): McDonald CR, Hagler DJ Jr, Ahmadi ME, Tecoma E, Iragui V,

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Abstract PURPOSE: To determine the nature and extent of regional cortical thinning in patients with mesial temporal lobe epilepsy (MTLE). METHODS: High-resolution volumetric MRIs were obtained on 21 patients with MTLE and 21 controls. Mean cortical thickness was measured within regions of interest and point-by-point across the neocortex using cortical reconstruction and parcellation software. RESULTS: Bilateral thinning was observed within frontal and lateral temporal regions in MTLE patients relative to controls. The most striking finding was bilateral cortical thinning in the precentral gyrus and immediately adjacent paracentral region and pars opercularis of the inferior frontal gyrus, extending to the orbital region. Within the temporal lobe, bilateral thinning was observed in Heschl's gyrus only. Ipsilateral only thinning was observed in the superior and middle temporal gyri, as well as in the medial orbital cortex. Greater asymmetries in cortical thickness were observed in medial temporal cortex in patients relative to controls. Individual subject analyses revealed that this asymmetry reflected significant ipsilateral thinning of medial temporal cortex in 33\% of patients, whereas it reflected ipsilateral thickening in 20\% of MTLEs. DISCUSSION: Patients with MTLE show widespread, bilateral pathology in neocortical regions that is not appreciated on standard imaging. Future studies are needed that elucidate the clinical implications of neocortical thinning in MTLE. This article was published in Epilepsia and referenced in International Journal of Neurorehabilitation

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