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Dynamic changes in white and gray matter volume are associated with outcome of surgical treatment in temporal lobe epilepsy.

Abstract：

BACKGROUND:The reasons for surgical failure in 30% of patients with unilateral mesial temporal lobe epilepsy (MTLE) are still unclear. We investigated if different outcomes could be associated to different patterns of subtle gray matter atrophy (GMA) and white matter atrophy (WMA), and searched for postoperative magnetic resonance imaging (MRI) changes. METHODS:We studied 69 controls and 67 operated patients with refractory unilateral MTLE. Patients were grouped as seizure-free (SF) group (34 patients Engel's IA), worthwhile improvement group (23 patients, Engel's IB-IIA) and failure group (10 patients Engel's IIB-IV). We created a voxel-based morphometry/MATLAB code to mask the surgical lacuna, and performed t-test and paired t-test to evaluate preoperative and postoperative MRI scans. RESULTS:Failure group showed a widespread pattern of preoperative GMA. On SF and improvement groups we identified a more restricted pattern of GMA. The three groups presented a widespread, bilateral pattern of WMA. In contrast, postoperative analyses showed bilateral hemispheric recovery (a relative increase of WM concentration) on SF and improvement groups, but few changes on failure group. We also identified areas with relative postoperative increase of GM on both SF and improvement groups, more widespread on SF group. CONCLUSION:Areas of subtle GMA may be related to poorer surgical outcome. In addition, we demonstrated a postoperative relative increase of WM and GM concentration associated with seizure control. These changes may represent neuroplasticity related to improvement of brain function after seizure control. Further studies with a multimodal approach may help to predict surgical outcome and improve selection of patients for surgical treatment of MTLE.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Yasuda CL,Valise C,Saúde AV,Pereira AR,Pereira FR,Ferreira Costa AL,Morita ME,Betting LE,Castellano G,Mantovani Guerreiro CA,Tedeschi H,de Oliveira E,Cendes F

doi

10.1016/j.neuroimage.2009.08.014

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

71-9

issue

1

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(09)00891-X

journal_volume

49

pub_type

杂志文章

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