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Subcortical white matter changes in the brain

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https://www.readbyqxmd.com/read/29121544/brain-volumetric-analysis-and-cortical-thickness-in-adults-with-saccadic-intrusions-ocular-flutter-or-opsoclonus-myoclonus-syndrome
#1
María-José Ibáñez-Juliá, Evangelia Pappa, Bertrand Gaymard, Delphine Leclercq, Charlotte Hautefort, Caroline Tilikete, Jean-Yves Delattre, Khê Hoang-Xuan, Dimitri Psimaras, Agusti Alentorn
OBJECTIVES: Ocular flutter (OF) and opsoclonus are considered a continuum with a similar pathogenesis. Due to the rarity of this disease in the adult population, little is known about the brain morphological changes in the chronic phase of the disease. PATIENTS AND METHODS: Six magnetic resonance imaging from adults with previous history of OF/Opsoclonus and 12 healthy patients (paired by age and sex) were analyzed in order to identify the long term cortical thickness pattern in this rare disease by using Freesurfer...
October 31, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29107772/gastric-bypass-surgery-induced-widespread-neural-plasticity-of-the-obese-human-brain
#2
Michael Rullmann, Sven Preusser, Sindy Poppitz, Stefanie Heba, Jana Hoyer, Tatjana Schütz, Arne Dietrich, Karsten Müller, Burkhard Pleger
Bariatric surgery has become the gold standard for the treatment of morbid obesity (body mass index (BMI) ≥ 40 kg/m(2)), but only few studies investigated its plastic influences on the obese brain. In this longitudinal study, we combined structural and functional magnetic resonance brain imaging (MRI) in 27 patients (BMI 47.8 ± 5.5 kg/m(2)) undergoing gastric-bypass surgery and 14 non-obese matched controls (BMI 24.7 ± 3.4 kg/m(2)). Over the first year after surgery, patients presented widespread changes in white matter density (WMD) as well as gray matter density (GMD) in the cerebral cortex of all lobes, subcortical structures, the brainstem as well as the cerebellum, but no changes in white matter water diffusivity throughout the brain...
October 28, 2017: NeuroImage
https://www.readbyqxmd.com/read/29106544/effects-of-adult-female-rat-androgenization-on-brain-morphology-and-metabolomic-profile
#3
Carmen Perez-Laso, Sebastián Cerdan, Carme Junque, Ángel Gómez, Esperanza Ortega, Mireia Mora, Carlos Avendaño, Esther Gómez-Gil, María Cruz Rodríguez Del Cerro, Antonio Guillamon
Androgenization in adult natal women, as in transsexual men (TM), affects brain cortical thickness and the volume of subcortical structures. In order to understand the mechanism underlying these changes we have developed an adult female rat model of androgenization. Magnetic resonance imaging and spectroscopy were used to monitor brain volume changes, white matter microstructure and ex vivo metabolic profiles over 32 days in androgenized and control subjects. Supraphysiological doses of testosterone prevents aging decrease of fractional anisotropy values, decreased general cortical volume and the relative concentrations of glutamine (Gln) and myo-Inositol (mI)...
July 6, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29100937/anatomicuts-hierarchical-clustering-of-tractography-streamlines-based-on-anatomical-similarity
#4
Viviana Siless, Ken Chang, Bruce Fischl, Anastasia Yendiki
Diffusion MRI tractography produces massive sets of streamlines that contain a wealth of information on brain connections. The size of these datasets creates a need for automated clustering methods to group the streamlines into meaningful bundles. Conventional clustering techniques group streamlines based on their spatial coordinates. Neuroanatomists, however, define white-matter bundles based on the anatomical structures that they go through or next to, rather than their spatial coordinates. Thus we propose a similarity measure for clustering streamlines based on their position relative to cortical and subcortical brain regions...
November 1, 2017: NeuroImage
https://www.readbyqxmd.com/read/29097412/brain-structural-changes-following-hiv-infection-meta-analysis
#5
E E O'Connor, Timothy A Zeffiro, Thomas A Zeffiro
BACKGROUND: Numerous studies have used structural neuroimaging to measure HIV effects on brain macroarchitecture. While many have reported changes in total brain volume, gray matter volume, white matter volume, CSF volume, and basal ganglia volume following HIV infection, quantitative inconsistencies observed across studies are large. PURPOSE: Our aim was to evaluate the consistency and temporal stability of serostatus effects on a range of structural neuroimaging measures...
November 2, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29093441/developmental-increases-in-white-matter-network-controllability-support-a-growing-diversity-of-brain-dynamics
#6
Evelyn Tang, Chad Giusti, Graham L Baum, Shi Gu, Eli Pollock, Ari E Kahn, David R Roalf, Tyler M Moore, Kosha Ruparel, Ruben C Gur, Raquel E Gur, Theodore D Satterthwaite, Danielle S Bassett
As the human brain develops, it increasingly supports coordinated control of neural activity. The mechanism by which white matter evolves to support this coordination is not well understood. Here we use a network representation of diffusion imaging data from 882 youth ages 8-22 to show that white matter connectivity becomes increasingly optimized for a diverse range of predicted dynamics in development. Notably, stable controllers in subcortical areas are negatively related to cognitive performance. Investigating structural mechanisms supporting these changes, we simulate network evolution with a set of growth rules...
November 1, 2017: Nature Communications
https://www.readbyqxmd.com/read/29061091/exploring-the-spectrum-of-subcortical-hyperintensities-and-cognitive-decline
#7
Yi-Chun Chen, Hsien-Hao Tsao, Yi-Chuan Chu, Jiun-Jie Wang, Jiann-Der Lee, Pi-Yueh Chang, Wen-Chuin Hsu
White matter hyperintensities (WMHs) include periventricular WMH (pvWMH) and deep WMH. When hyperintensities in the basal ganglia or brainstem are included, the collective term is subcortical hyperintensities. Both WMH and medial temporal lobe atrophy (MTA) are risk factors for cognitive decline. This prospective study enrolled participants aged 50-85 years and followed their neuropsychological assessments annually for 2 years to explore the interactive effects of WMH and MTA on longitudinal clinical decline...
October 24, 2017: Journal of Neuropsychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/29054917/longitudinal-diffusion-imaging-across-the-c9orf72-clinical-spectrum
#8
Mary Kay Floeter, Laura E Danielian, Laura E Braun, Tianxia Wu
INTRODUCTION: Discrepancies between diffusion tensor imaging (DTI) findings and functional rating scales in amyotrophic lateral sclerosis (ALS) may be due to symptom heterogeneity, particularly coexisting cognitive-behavioural dysfunction affecting non-motor regions of the brain. Carriers of expansion mutations in the C9orf72 gene, whose motor and cognitive-behavioural symptoms span a range from ALS to frontotemporal dementia, present an opportunity to evaluate the relationship between symptom heterogeneity and DTI changes...
October 20, 2017: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/29021356/volumetric-brain-changes-in-migraineurs-from-the-general-population
#9
Inge H Palm-Meinders, Enrico B Arkink, Hille Koppen, Souad Amlal, Gisela M Terwindt, Lenore J Launer, Mark A van Buchem, Michel D Ferrari, Mark C Kruit
OBJECTIVE: To assess volumetric brain changes in migraineurs from the general population compared with controls. METHODS: Structural brain changes in migraineurs from the general population-based MRI Cerebral Abnormalities in Migraine, an Epidemiologic Risk Analysis (CAMERA)-2 observational cohort study were assessed by state-of-the-art voxel-based morphometry. T1-weighted MRIs of 84 migraineurs (52 with aura, 32 without aura) and 35 headache-free controls were evaluated...
October 11, 2017: Neurology
https://www.readbyqxmd.com/read/28989801/blood-pressure-gradients-in-cerebral-arteries-a-clue-to-pathogenesis-of-cerebral-small-vessel-disease
#10
Pablo J Blanco, Lucas O Müller, J David Spence
RATIONALE: The role of hypertension in cerebral small vessel disease is poorly understood. At the base of the brain (the 'vascular centrencephalon'), short straight arteries transmit blood pressure directly to small resistance vessels; the cerebral convexity is supplied by long arteries with many branches, resulting in a drop in blood pressure. Hypertensive small vessel disease (lipohyalinosis) causes the classically described lacunar infarctions at the base of the brain; however, periventricular white matter intensities (WMIs) seen on MRI and WMI in subcortical areas over the convexity, which are often also called 'lacunes', probably have different aetiologies...
September 2017: Stroke and Vascular Neurology
https://www.readbyqxmd.com/read/28971007/evaluation-of-striatonigral-connectivity-using-probabilistic-tractography-in-parkinson-s-disease
#11
Frances Theisen, Rebecca Leda, Vincent Pozorski, Jennifer M Oh, Nagesh Adluru, Rachel Wong, Ozioma Okonkwo, Douglas C Dean, Barbara B Bendlin, Sterling C Johnson, Andrew L Alexander, Catherine L Gallagher
The cardinal movement abnormalities of Parkinson's disease (PD), including tremor, muscle rigidity, and reduced speed and frequency of movements, are caused by degeneration of dopaminergic neurons in the substantia nigra that project to the putamen, compromising information flow through frontal-subcortical circuits. Typically, the nigrostriatal pathway is more severely affected on the side of the brain opposite (contralateral) to the side of the body that manifests initial symptoms. Several studies have suggested that PD is also associated with changes in white matter microstructural integrity...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28936822/-posterior-reversible-encephalopathy-syndrome-triggerred-by-alcohol-withdrawal
#12
Tuğçe Mengi, Yaprak Seçil, Aysel Çoban, Yeşim Beckmann
INTRODUCTION: Posterior reversible encephalopathy syndrome (PRES) is a clinico-radiological entity characterized by headache, altered mental status, epileptic seizures, visual disturbances and typically transient changes in posterior cerebral circulation areas. In this article, we present a case of alcohol withdrawal accompanied by PRES. CASE PRESENTATION: A 53-year-old male patient presented to the emergency department with visual hallucinations and meaningless speech...
2017: Türk Psikiyatri Dergisi, Turkish Journal of Psychiatry
https://www.readbyqxmd.com/read/28924555/early-changes-in-brain-structure-correlate-with-language-outcomes-in-children-with-neonatal-encephalopathy
#13
Kevin A Shapiro, Hosung Kim, Maria Luisa Mandelli, Elizabeth E Rogers, Dawn Gano, Donna M Ferriero, A James Barkovich, Maria Luisa Gorno-Tempini, Hannah C Glass, Duan Xu
Global patterns of brain injury correlate with motor, cognitive, and language outcomes in survivors of neonatal encephalopathy (NE). However, it is still unclear whether local changes in brain structure predict specific deficits. We therefore examined whether differences in brain structure at 6 months of age are associated with neurodevelopmental outcomes in this population. We enrolled 32 children with NE, performed structural brain MR imaging at 6 months, and assessed neurodevelopmental outcomes at 30 months...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28902409/binswanger-s-disease-biomarkers-in-the-inflammatory-form-of-vascular-cognitive-impairment-and-dementia
#14
REVIEW
Gary A Rosenberg
Vascular cognitive impairment and dementia (VCID) is a major public health concern because of the increased incidence of vascular disease in the aging population and the impact of vascular disease on Alzheimer's disease. VCID is a heterogeneous group of diseases for which there are no proven treatments. Biomarkers can be used to select more homogeneous populations. Small vessel disease is the most prevalent form of VCID and is the optimal form for treatment trials because there is a progressive course with characteristic pathological changes...
September 13, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28867898/cortical-oligodendrocytes-in-kaolin-induced-hydrocephalus-in-wistar-rat-impact-of-degree-and-duration-of-ventriculomegaly
#15
Olugbenga Ayodeji Ayannuga, Thajasvarie Naicker
BACKGROUND: Oligodendrocytes are critical to the function of the brain. They generate the myelin sheath which ensures saltatory conduction, which is a more energy saving and efficient means of axonal impulse transmission. Ventriculomegaly results in neuronal degeneration and astrogliosis. PURPOSE: The effect of the degree of ventriculomegaly on oligodendrocyte in kaolin-induced hydrocephalus and the timeline have not been extensively documented, hence this study...
July 2017: Annals of Neurosciences
https://www.readbyqxmd.com/read/28867652/the-neuropsychology-and-neurobiology-of-late-onset-schizophrenia-and-very-late-onset-schizophrenia-like-psychosis-a-critical-review
#16
REVIEW
Lies Van Assche, Manuel Morrens, Patrick Luyten, Luc Van de Ven, Mathieu Vandenbulcke
OBJECTIVE: The current review discusses neuropsychological profiles and the longitudinal course of cognitive dysfunction in Late Onset Schizophrenia (LOS) and Very-late-onset schizophrenia-like psychosis (VLOSLP), and attempts to clarify its neurobiological underpinnings. METHOD: A systematic literature search resulted in 29 publications describing original research on the neuropsychology of LOS/VLOSLP and 46 studies focussing on neurobiology. RESULTS: Although mildly progressive cognitive impairment is usually present, only a subgroup of LOS/VLOSLP develops dementia during a 10-year follow-up succeeding the onset of psychosis...
September 1, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28864026/cardiac-cycle-induced-epi-time-series-fluctuations-in-the-brain-their-temporal-shifts-inflow-effects-and-t2-%C3%A2-fluctuations
#17
Olivia Viessmann, Harald E Möller, Peter Jezzard
The cardiac-induced arterial pressure wave causes changes in cerebral blood flow velocities and volumes that affect the signals in echo-planar imaging (EPI). Using single-echo EPI time series data, acquired fast enough to unalias the cardiac frequency, we found that the cardiac cycle-induced signal fluctuations are delayed differentially in different brain regions. When referenced to the time series in larger arterial structures, the cortical voxels are only minimally shifted but significant shifts are observed in subcortical areas...
August 31, 2017: NeuroImage
https://www.readbyqxmd.com/read/28855495/adult-onset-leukoencephalopathy-with-axonal-spheroids-and-pigmented-glia-a-case-presented-brain-calcification-and-corpus-callosum-atrophy-from-over-10-years-before-the-onset-of-dementia
#18
Miyuki Okamoto, Jun Takeshita, Kazunori Takahashi, Akio Tanaka, Kunihiro Yoshida, Masaru Kuriyama
A 44-year-old man made many mistakes at work over a year. Eleven years prior, he had had medical examination with headache. He presented with symptoms consistent with frontal lobe dysfunction including cognitive decline, and bilateral pyramidal signs. Brain MRI showed cerebral atrophy, localized atrophy of corpus callosum, asymmetrical white matter lesions and multiple cystic lesions. CT images showed bilateral calcifications in the parietal subcortical white matter. Reconstructed sagittal CT images showed bilateral calcifications in the frontal white matter adjacent to the anterior horns of the lateral ventricles, which had a symmetrical "stepping stone appearance" in the frontal pericallosal regions...
September 30, 2017: Rinshō Shinkeigaku, Clinical Neurology
https://www.readbyqxmd.com/read/28835651/brain-plasticity-following-mi-bci-training-combined-with-tdcs-in-a-randomized-trial-in-chronic-subcortical-stroke-subjects-a-preliminary-study
#19
Xin Hong, Zhong Kang Lu, Irvin Teh, Fatima Ali Nasrallah, Wei Peng Teo, Kai Keng Ang, Kok Soon Phua, Cuntai Guan, Effie Chew, Kai-Hsiang Chuang
Brain-computer interface-assisted motor imagery (MI-BCI) or transcranial direct current stimulation (tDCS) has been used in stroke rehabilitation, though their combinatory effect is unknown. We investigated brain plasticity following a combined MI-BCI and tDCS intervention in chronic subcortical stroke patients with unilateral upper limb disability. Nineteen patients were randomized into tDCS and sham-tDCS groups. Diffusion and perfusion MRI, and transcranial magnetic stimulation were used to study structural connectivity, cerebral blood flow (CBF), and corticospinal excitability, respectively, before and 4 weeks after the 2-week intervention...
August 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818116/distinct-white-matter-microstructural-abnormalities-and-extracellular-water-increases-relate-to-cognitive-impairment-in-alzheimer-s-disease-with-and-without-cerebrovascular-disease
#20
Fang Ji, Ofer Pasternak, Siwei Liu, Yng Miin Loke, Boon Linn Choo, Saima Hilal, Xin Xu, Mohammad Kamran Ikram, Narayanaswamy Venketasubramanian, Christopher Li-Hsian Chen, Juan Zhou
BACKGROUND: Mixed vascular and neurodegenerative dementia, such as Alzheimer's disease (AD) with concomitant cerebrovascular disease, has emerged as the leading cause of age-related cognitive impairment. The brain white matter (WM) microstructural changes in neurodegeneration well-documented by diffusion tensor imaging (DTI) can originate from brain tissue or extracellular free water changes. The differential microstructural and free water changes in AD with and without cerebrovascular disease, especially in normal-appearing WM, remain largely unknown...
August 17, 2017: Alzheimer's Research & Therapy
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