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MRI focal cortical dysplasia

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https://www.readbyqxmd.com/read/29909256/task-induced-gamma-band-effect-in-type-ii-focal-cortical-dysplasia-an-exploratory-study
#1
Sabrine Souci, Mathilde Petton, Julien Jung, Pierre Bourdillon, Romain Bouet, Aurélie Richard-Mornas, Nathalie Streichenberger, Hélène Catenoix, Alexandra Montavont, Jean Isnard, Marc Guenot, Philippe Kahane, Jean-Philippe Lachaux, Sylvain Rheims
OBJECTIVE: Few data are available about the functionality of type II focal cortical dysplasia (FCD). Identification of high-frequency activities (HFAs) induced by cognitive tasks has been proposed as an additional way to map cognitive functions in patients undergoing presurgical evaluation using stereoelectroencephalography (SEEG). However, the repetitive subcontinuous spiking pattern which characterizes type II FCD might limit the reliability of this approach, and its feasibility in these patients remains to be evaluated...
June 14, 2018: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29909183/predictors-and-outcome-surgery-for-posterior-cortex-epilepsies
#2
Jianguo Shi, Zaifen Gao, Jun Gao, Gang Li, Yehong Chen
OBJECTIVE: The aim of this study is to identify the prognostic role of MRI and EEG in posterior cortex epilepsies (PCES) and to characterize their clinical features. PATIENT AND METHODS: We retrospectively studied 54 consecutive patients (18 females, 36 males) from April 2011 to November 2015, who had undergone PCES surgery. Electro-clinical, pathological and surgical data were evaluated. Of the patients, 18 (33.3%) patients underwent a cortical resection (corticectomy), 10 (18...
June 9, 2018: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29793134/voxel-based-automated-detection-of-focal-cortical-dysplasia-lesions-using-diffusion-tensor-imaging-and-t2-weighted-mri-data
#3
Yanming Wang, Yawen Zhou, Huijuan Wang, Jin Cui, Benedictor Alexander Nguchu, Xufei Zhang, Bensheng Qiu, Xiaoxiao Wang, Mingwang Zhu
The aim of this study was to automatically detect focal cortical dysplasia (FCD) lesions in patients with extratemporal lobe epilepsy by relying on diffusion tensor imaging (DTI) and T2-weighted magnetic resonance imaging (MRI) data. We implemented an automated classifier using voxel-based multimodal features to identify gray and white matter abnormalities of FCD in patient cohorts. In addition to the commonly used T2-weighted image intensity feature, DTI-based features were also utilized. A Gaussian processes for machine learning (GPML) classifier was tested on 12 patients with FCD (8 with histologically confirmed FCD) scanned at 1...
May 21, 2018: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29782369/neuroimaging-in-epilepsy
#4
Meneka Kaur Sidhu, John S Duncan, Josemir W Sander
PURPOSE OF REVIEW: Epilepsy neuroimaging is important for detecting the seizure onset zone, predicting and preventing deficits from surgery and illuminating mechanisms of epileptogenesis. An aspiration is to integrate imaging and genetic biomarkers to enable personalized epilepsy treatments. RECENT FINDINGS: The ability to detect lesions, particularly focal cortical dysplasia and hippocampal sclerosis, is increased using ultra high-field imaging and postprocessing techniques such as automated volumetry, T2 relaxometry, voxel-based morphometry and surface-based techniques...
May 17, 2018: Current Opinion in Neurology
https://www.readbyqxmd.com/read/29738718/bilateral-thalamocortical-abnormalities-in-focal-cortical-dysplasia
#5
Arthur Rezayev, Henry A Feldman, Jacob Levman, Emi Takahashi
BACKGROUND AND PURPOSE: Focal cortical dysplasia (FCD), a congenital malformation of the neocortex and one of the most common causes of medication resistant epilepsy in pediatric populations, can be studied noninvasively by diffusion tensor imaging (DTI). The present study aimed to quantify changes in the thalamus and thalamocortical pathways with respect to fractional anisotropy (FA), apparent diffusion coefficient (ADC), volume, and other common measures. MATERIALS & METHODS: The study quantified data collected from pediatric patients with a prior diagnosis of FCD; 75 patients (35 females, 10...
May 5, 2018: Brain Research
https://www.readbyqxmd.com/read/29704039/correction-to-18-f-fdg-pet-in-drug-resistant-epilepsy-due-to-focal-cortical-dysplasia-type-2-additional-value-of-electroclinical-data-and-coregistration-with-mri
#6
Serge Desarnaud, Charles Mellerio, Franck Semah, Agathe Laurent, Elisabeth Landre, Bertrand Devaux, Catherine Chiron, Vincent Lebon, Francine Chassoux
The original version of this article has added numbers in the text which are unnecessary. Correct line should be: "We also performed PET/MRI based surgical resections in an increasing number of MRI negative/ doubtful cases with favourable outcome."
April 28, 2018: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/29679388/somatic-slc35a2-variants-in-the-brain-are-associated-with-intractable-neocortical-epilepsy
#7
Melodie R Winawer, Nicole G Griffin, Jorge Samanamud, Evan H Baugh, Dinesh Rathakrishnan, Senthilmurugan Ramalingam, David Zagzag, Catherine A Schevon, Patricia Dugan, Manu Hegde, Sameer A Sheth, Guy M McKhann, Werner K Doyle, Gerald A Grant, Brenda E Porter, Mohamad A Mikati, Carrie R Muh, Colin D Malone, Ann Marie R Bergin, Jurriaan M Peters, Danielle K McBrian, Alison M Pack, Cigdem I Akman, Christopher M LaCoursiere, Katherine M Keever, Joseph R Madsen, Edward Yang, Hart G W Lidov, Catherine Shain, Andrew S Allen, Peter D Canoll, Peter B Crino, Annapurna H Poduri, Erin L Heinzen
OBJECTIVE: Somatic variants are a recognized cause of epilepsy-associated focal malformations of cortical development (MCD). We hypothesized that somatic variants may underlie a wider range of focal epilepsy, including nonlesional focal epilepsy (NLFE). Through genetic analysis of brain tissue, we evaluated the role of somatic variation in focal epilepsy with and without MCD. METHODS: We identified somatic variants through high-depth exome and ultra-high-depth candidate gene sequencing of DNA from epilepsy surgery specimens and leukocytes from 18 individuals with NLFE and 38 with focal MCD...
April 20, 2018: Annals of Neurology
https://www.readbyqxmd.com/read/29649770/advanced-dynamic-statistical-parametric-mapping-with-meg-in-localizing-epileptogenicity-of-the-bottom-of-sulcus-dysplasia
#8
Midori Nakajima, Simeon Wong, Elysa Widjaja, Shiro Baba, Tohru Okanishi, Lynne Takada, Yosuke Sato, Hiroki Iwata, Maya Sogabe, Hikaru Morooka, Robyn Whitney, Yuki Ueda, Tomoshiro Ito, Kazuyori Yagyu, Ayako Ochi, O Carter Snead, James T Rutka, James M Drake, Sam Doesburg, Fumiya Takeuchi, Hideaki Shiraishi, Hiroshi Otsubo
OBJECTIVE: To investigate whether advanced dynamic statistical parametric mapping (AdSPM) using magnetoencephalography (MEG) can better localize focal cortical dysplasia at bottom of sulcus (FCDB). METHODS: We analyzed 15 children with diagnosis of FCDB in surgical specimen and 3 T MRI by using MEG. Using AdSPM, we analyzed a ±50 ms epoch relative to each single moving dipole (SMD) and applied summation technique to estimate the source activity. The most active area in AdSPM was defined as the location of AdSPM spike source...
June 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29618099/surgical-treatment-of-extratemporal-epilepsy-results-and-prognostic-factors
#9
Daniel Delev, Bernhard Oehl, Bernhard J Steinhoff, Julia Nakagawa, Christian Scheiwe, Andreas Schulze-Bonhage, Josef Zentner
BACKGROUND: Surgery is a widely accepted option for the treatment of pharmacoresistant epilepsies of extratemporal origin. OBJECTIVE: To analyze clinical and epileptological results and to provide prognostic factors influencing seizure outcome. METHODS: This retrospective single-center study comprises a consecutive series of 383 patients, most of whom had an identifiable lesion on MRI, who underwent resective surgery for extratemporal epilepsy...
March 30, 2018: Neurosurgery
https://www.readbyqxmd.com/read/29594410/-18-f-fdg-pet-in-drug-resistant-epilepsy-due-to-focal-cortical-dysplasia-type-2-additional-value-of-electroclinical-data-and-coregistration-with-mri
#10
Serge Desarnaud, Charles Mellerio, Franck Semah, Agathe Laurent, Elisabeth Landre, Bertrand Devaux, Catherine Chiron, Vincent Lebon, Francine Chassoux
PURPOSE: To assess the localizing value of 18 F-FDG PET in patients operated on for drug-resistant epilepsy due to focal cortical dysplasia type 2 (FCD2 ). METHODS: We analysed 18 F-FDG PET scans from 103 consecutive patients (52 males, 7-65 years old) with histologically proven FCD2 . PET and MRI data were first reviewed by visual analysis blinded to clinical information and FCD2 location. The additional value of electroclinical data and PET/MRI coregistration was assessed by comparison with pathological results and surgical outcomes...
March 29, 2018: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/29588945/seven-tesla-mri-improves-detection-of-focal-cortical-dysplasia-in-patients-with-refractory-focal-epilepsy
#11
Tim J Veersema, Cyrille H Ferrier, Pieter van Eijsden, Peter H Gosselaar, Eleonora Aronica, Fredy Visser, Jaco M Zwanenburg, Gerard A P de Kort, Jeroen Hendrikse, Peter R Luijten, Kees P J Braun
Objective: The aim of this study is to determine whether the use of 7 tesla (T) MRI in clinical practice leads to higher detection rates of focal cortical dysplasias in possible candidates for epilepsy surgery. Methods: In our center patients are referred for 7 T MRI if lesional focal epilepsy is suspected, but no abnormalities are detected at one or more previous, sufficient-quality lower-field MRI scans, acquired with a dedicated epilepsy protocol, or when concealed pathology is suspected in combination with MR-visible mesiotemporal sclerosis-dual pathology...
June 2017: Epilepsia Open
https://www.readbyqxmd.com/read/29554575/interictal-regional-paroxysmal-fast-activity-on-scalp-eeg-is-common-in-patients-with-underlying-gliosis
#12
Gopal Krishna Dash, Chaturbhuj Rathore, Malcolm K Jeyaraj, Pandurang Wattamwar, Sankara P Sarma, Kurupath Radhakrishnan
OBJECTIVE: Interictal regional paroxysmal fast activity (RPFA) on scalp EEG is common in patients with focal cortical dysplasia (FCD). Little data exists regarding the presence of RPFA in other etiologies. METHODS: We studied the association between RPFA and etiology on MRI in patients with drug resistant focal epilepsy undergoing presurgical evaluation in 2011. RPFA was defined as ≥3 consecutive spikes with a frequency of ≥10 Hz lasting ≥300 ms but <4 s...
May 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29550061/lesion-focused-radiofrequency-thermocoagulation-of-bottom-of-sulcus-focal-cortical-dysplasia-type-iib-conceptional-considerations-with-regard-to-the-epileptogenic-zone
#13
Jörg Wellmer
Small bottom-of-sulcus focal cortical dysplasias (BOS-FCD) type IIb are intrinsically epileptogenic lesions often responsible for pharmacoresistant epilepsy. They are increasingly well demarcated in vivo from surrounding cortex and white matter by 3 T magnetic resonance imaging (MRI). These facts and frequent seizure freedom after just narrow resections allow questioning the classical concept of epilepsy surgery in which the epileptogenic lesion is generally considered only one part of the epileptogenic zone and the resection volume categorically has to exceed lesion limits...
May 2018: Epilepsy Research
https://www.readbyqxmd.com/read/29541057/small-lesion-size-is-associated-with-sleep-related-epilepsy-in-focal-cortical-dysplasia-type-ii
#14
Bo Jin, Wenhan Hu, Linmei Ye, Balu Krishnan, Thandar Aung, Stephen E Jones, Imad M Najm, Andreas V Alexopoulos, Kai Zhang, Junming Zhu, Jianguo Zhang, Meiping Ding, Zhong Chen, Shuang Wang, Zhong Irene Wang
Objective: To investigate the neuroimaging and clinical features associated with sleep-related epilepsy (SRE) in patients with focal cortical dysplasia (FCD) type II. Methods: Patients with histopathologically proven FCD type II were included from three epilepsy centers. SRE was defined according to the video EEG findings and seizure history. Cortical surface reconstruction and volume calculation were performed using FreeSurfer. The lesions were manually delineated on T1 volumetric MRI using the ITK-SNAP software...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29510282/multimodal-approach-for-radical-excision-of-focal-cortical-dysplasia-by-combining-advanced-magnetic-resonance-imaging-data-to-intraoperative-ultrasound-electrocorticography-and-cortical-stimulation-a-preliminary-experience
#15
Giovanni Tringali, Beatrice Bono, Ivano Dones, Roberto Cordella, Giuseppe Didato, Flavio Villani, Francesco Prada
BACKGROUND AND OBJECTIVE: Type II focal cortical dysplasia is the most common malformation of cortical development associated with drug resistant epilepsy and susceptible to surgical resection. Although, at present, advanced imaging modalities are capable of detecting most cortical disorders, it is still a challenge for the surgeon to visualize them intraoperatively. The lack of direct identification between normal brain and subtle dysplastic tissue may explain the poor results in terms of being seizure-free versus other forms of epilepsy...
May 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29445916/bottom-of-sulcus-focal-cortical-dysplasia-presenting-as-epilepsia-partialis-continua-multimodality-characterization-including-7t-mri
#16
Sarah A Kelley, Shenandoah Robinson, Nathan E Crone, Bruno P Soares
INTRODUCTION: Bottom-of-sulcus focal cortical dysplasias are an under recognized, surgically treatable cause of focal epilepsy. Resection can dramatically reduce the seizure burden for children with refractory epilepsy, or eliminate seizures altogether. MATERIAL AND METHODS: We report the case and present the results of multimodality evaluation of a 15-year-old young man who presented with long-standing partial epilepsy affecting his right leg, which over the years became refractory to therapy...
February 14, 2018: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29422363/histopathology-of-3-tesla-mri-negative-extratemporal-focal-epilepsies
#17
Evangelos Kogias, Dirk-Matthias Altenmüller, Jan-Helge Klingler, Barbara Schmeiser, Horst Urbach, Soroush Doostkam
BACKGROUND: Information about the histopathology in 3 Tesla MRI negative extratemporal epilepsies is relatively limited. Most common histopathological findings in earlier (mixed 1.5 or 3 Tesla) MRI-negative series are focal cortical dysplasia (FCD), gliosis or normal findings. These series mostly use the older Palmini criteria for classification and grading. We focus on histopathology of only 3 Tesla MRI-negative extratemporal epilepsies according to the current ILAE criteria and investigate potential correlation to seizure outcome 1 year postoperatively...
April 2018: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/29414526/morphometric-analysis-on-t1-weighted-mri-complements-visual-mri-review-in-focal-cortical-dysplasia
#18
Lily C Wong-Kisiel, Diego F Tovar Quiroga, Daniel L Kenney-Jung, Robert J Witte, Alexandra Santana-Almansa, Gregory A Worrell, Jeffrey Britton, Benjamin H Brinkmann
OBJECTIVE: Focal cortical dysplasia (FCD) is a common pathology in focal drug resistant epilepsy (DRE). Voxel based morphometric MRI analysis has been proposed as an adjunct to visual detection of FCD, which remains challenging given the subtle radiographic appearance of FCD. This study evaluates the diagnostic value of morphometric analysis program (MAP) in focal DRE with pathology-confirmed FCD. METHODS: Automated morphometric analysis program analysis generated z-score maps derived from T1 images, referenced to healthy adult or pediatric controls for each of 39 cases with pathology-confirmed FCD...
February 2018: Epilepsy Research
https://www.readbyqxmd.com/read/29398181/utility-of-additional-dedicated-high-resolution-3t-mri-in-children-with-medically-refractory-focal-epilepsy
#19
Raheel Ahmed, Luc Rubinger, Cristina Go, James M Drake, James T Rutka, O Carter Snead, Elysa Widjaja
PURPOSE: In patients with medically refractory epilepsy and normal magnetic resonance imaging (MRI), high-resolution dedicated MRI may identify cryptic lesions. The aim of this study was to assess improvement in lesion detection and its impact on clinical management, using additional high-resolution dedicated 3T MRI in children with medically refractory epilepsy who had normal 3T epilepsy protocol MRI. MATERIALS AND METHODS: Children who had resective epilepsy surgery and suspected focal cortical dysplasia (FCD) or normal 3T epilepsy protocol MRI were included...
February 2, 2018: Epilepsy Research
https://www.readbyqxmd.com/read/29334038/robotic-assisted-and-image-guided-mri-compatible-stereoelectroencephalography
#20
Jeffery A Hall, Hui Ming Khoo
BACKGROUND: Stereoelectroencephalography has been in regular use at the Montreal Neurological Institute since 1972. The technique has been in constant evolution to incorporate advances in materials, imaging, and robotics technology. MRI-compatible electrodes were introduced in 2007 and robotics in 2011. Here we report on the technique, safety, and advantages of our current method of stereoelectroencephalography implantation. METHODS: We retrospectively reviewed all patients who underwent stereoelectroencephalography by the senior author...
January 2018: Canadian Journal of Neurological Sciences. le Journal Canadien des Sciences Neurologiques
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