OBJECTIVE: To evaluate white matter (WM) integrity of distinct groups of patients with antiepileptic drug (AED)-resistant localization-related epilepsies. METHODS: We used diffusion tensor imaging (DTI) fiber-tractography and voxel-based morphometry (VBM) to investigate differences of WM micro- and macrostructural integrity in patients with different drug-resistant localization-related epilepsies: 17 with temporal lobe epilepsy with magnetic resonance imaging (MRI) signs of hippocampal sclerosis (TLE-HS), 17 with TLE and normal MRI (TLE-NL), 14 with frontal lobe epilepsy and subtle MRI signs of focal cortical dysplasia (FLE-FCD), and 112 healthy controls. We performed fiber-tractography using a semiautomatic deterministic method to yield average fractional anisotropy (FA), axial (AD), and radial (RD) diffusivity ipsilateral and contralateral to the epileptogenic zone of the following tracts based on their functional and anatomic relevance: body of fornix (BoF), body of cingulum (BoC), inferior frontal occipital (IFO), and uncinate fasciculi (UF). In addition, we performed VBM of the WM maps to assess macrostructural integrity differences among groups. RESULTS: TLE-HS had ipsilateral and contralateral decreased FA and increased RD for all tracts. VBM showed WM alterations mainly in the ipsilateral parahippocampal region and contralateral superior temporal gyrus. FLE-FCD showed bilateral FA decreases only in the BoC and ipsilateral RD increases also in the BoC. VBM showed WM reduction mainly in the ipsilateral precuneus and posterior and anterior cingulum. No significant WM alterations were found in the TLE-NL in DTI or VBM analysis. SIGNIFICANCE: WM abnormalities differ in distinct AED-resistant localization-related epilepsies. The diverse distribution of the WM damage in these patients suggests that the localization of the epileptic networks may play a role in the WM burden. However, the distinct degree of this damage, more accentuated in TLE-HS, also suggests that the underlying cause of the epilepsy is probably an additional factor to explain this WM damage. Wiley Periodicals, Inc.
OBJECTIVE: To evaluate white matter (WM) integrity of distinct groups of patients with antiepileptic drug (AED)-resistant localization-related epilepsies. METHODS: We used diffusion tensor imaging (DTI) fiber-tractography and voxel-based morphometry (VBM) to investigate differences of WM micro- and macrostructural integrity in patients with different drug-resistant localization-related epilepsies: 17 with temporal lobe epilepsy with magnetic resonance imaging (MRI) signs of hippocampal sclerosis (TLE-HS), 17 with TLE and normal MRI (TLE-NL), 14 with frontal lobe epilepsy and subtle MRI signs of focal cortical dysplasia (FLE-FCD), and 112 healthy controls. We performed fiber-tractography using a semiautomatic deterministic method to yield average fractional anisotropy (FA), axial (AD), and radial (RD) diffusivity ipsilateral and contralateral to the epileptogenic zone of the following tracts based on their functional and anatomic relevance: body of fornix (BoF), body of cingulum (BoC), inferior frontal occipital (IFO), and uncinate fasciculi (UF). In addition, we performed VBM of the WM maps to assess macrostructural integrity differences among groups. RESULTS:TLE-HS had ipsilateral and contralateral decreased FA and increased RD for all tracts. VBM showed WM alterations mainly in the ipsilateral parahippocampal region and contralateral superior temporal gyrus. FLE-FCD showed bilateral FA decreases only in the BoC and ipsilateral RD increases also in the BoC. VBM showed WM reduction mainly in the ipsilateral precuneus and posterior and anterior cingulum. No significant WM alterations were found in the TLE-NL in DTI or VBM analysis. SIGNIFICANCE: WM abnormalities differ in distinct AED-resistant localization-related epilepsies. The diverse distribution of the WM damage in these patients suggests that the localization of the epileptic networks may play a role in the WM burden. However, the distinct degree of this damage, more accentuated in TLE-HS, also suggests that the underlying cause of the epilepsy is probably an additional factor to explain this WM damage. Wiley Periodicals, Inc.
Authors: Shahin Tavakol; Jessica Royer; Alexander J Lowe; Leonardo Bonilha; Joseph I Tracy; Graeme D Jackson; John S Duncan; Andrea Bernasconi; Neda Bernasconi; Boris C Bernhardt Journal: Epilepsia Date: 2019-03-19 Impact factor: 5.864
Authors: Lucy F Robinson; Xiaosong He; Paul Barnett; Gaёlle E Doucet; Michael R Sperling; Ashwini Sharan; Joseph I Tracy Journal: Hum Brain Mapp Date: 2016-09-15 Impact factor: 5.038
Authors: Boris C Bernhardt; Fatemeh Fadaie; Min Liu; Benoit Caldairou; Shi Gu; Elizabeth Jefferies; Jonathan Smallwood; Danielle S Bassett; Andrea Bernasconi; Neda Bernasconi Journal: Neurology Date: 2019-04-19 Impact factor: 9.910
Authors: Sean N Hatton; Khoa H Huynh; Leonardo Bonilha; Eugenio Abela; Saud Alhusaini; Andre Altmann; Marina K M Alvim; Akshara R Balachandra; Emanuele Bartolini; Benjamin Bender; Neda Bernasconi; Andrea Bernasconi; Boris Bernhardt; Núria Bargallo; Benoit Caldairou; Maria E Caligiuri; Sarah J A Carr; Gianpiero L Cavalleri; Fernando Cendes; Luis Concha; Esmaeil Davoodi-Bojd; Patricia M Desmond; Orrin Devinsky; Colin P Doherty; Martin Domin; John S Duncan; Niels K Focke; Sonya F Foley; Antonio Gambardella; Ezequiel Gleichgerrcht; Renzo Guerrini; Khalid Hamandi; Akari Ishikawa; Simon S Keller; Peter V Kochunov; Raviteja Kotikalapudi; Barbara A K Kreilkamp; Patrick Kwan; Angelo Labate; Soenke Langner; Matteo Lenge; Min Liu; Elaine Lui; Pascal Martin; Mario Mascalchi; José C V Moreira; Marcia E Morita-Sherman; Terence J O'Brien; Heath R Pardoe; José C Pariente; Letícia F Ribeiro; Mark P Richardson; Cristiane S Rocha; Raúl Rodríguez-Cruces; Felix Rosenow; Mariasavina Severino; Benjamin Sinclair; Hamid Soltanian-Zadeh; Pasquale Striano; Peter N Taylor; Rhys H Thomas; Domenico Tortora; Dennis Velakoulis; Annamaria Vezzani; Lucy Vivash; Felix von Podewils; Sjoerd B Vos; Bernd Weber; Gavin P Winston; Clarissa L Yasuda; Alyssa H Zhu; Paul M Thompson; Christopher D Whelan; Neda Jahanshad; Sanjay M Sisodiya; Carrie R McDonald Journal: Brain Date: 2020-08-01 Impact factor: 13.501