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https://www.readbyqxmd.com/read/28722240/an-mri-hyperintense-acute-reperfusion-marker-is-related-to-elevated-peripheral-monocyte-count-in-acute-ischemic-stroke
#1
Zurab Nadareishvili, Marie Luby, Richard Leigh, Jignesh Shah, John K Lynch, Amie W Hsia, Richard T Benson, Lawrence L Latour
BACKGROUND AND PURPOSE: Blood-brain barrier (BBB) disruption detected on magnetic resonance imaging (MRI) in acute ischemic stroke as a hyperintense acute reperfusion marker (HARM) is associated with upregulation of matrix metalloproteinase-9 (MMP-9). Although activated leukocytes, including monocytes, are the main source of MMPs, limited data exist to support relationship between leukocyte activation and BBB disruption in patients with acute ischemic stroke. The goal of this study is to investigate the relationship between neutrophils, lymphocytes, and monocytes with BBB disruption detected as HARM (+) in patients with acute ischemic stroke...
July 19, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28705823/transient-focal-neurologic-symptoms-correspond-to-regional-cerebral-hypoperfusion-by-mri-a-stroke-mimic-in-children
#2
L L Lehman, A R Danehy, C C Trenor, C F Calahan, M E Bernson-Leung, R L Robertson, M J Rivkin
Children who present with acute transient focal neurologic symptoms raise concern for stroke or transient ischemic attack. We present a series of 16 children who presented with transient focal neurologic symptoms that raised concern for acute stroke but who had no evidence of infarction and had unilateral, potentially reversible imaging features on vascular and perfusion-sensitive brain MR imaging. Patients were examined with routine brain MR imaging, MRA, perfusion-sensitive sequences, and DWI. Fourteen (88%) children had lateralized MRA evidence of arterial tree pruning without occlusion, all had negative DWI findings, and all showed evidence of hemispheric hypoperfusion by susceptibility-weighted imaging or arterial spin-labeling perfusion imaging at presentation...
July 13, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28693299/magnetic-resonance-imaging-characteristics-of-ischemic-brain-infarction-according-to-time-passage-in-a-canine-stroke-model
#3
Sooyoung Choi, Daji Noh, Youngwhan Kim, Inseong Jeong, Hojung Choi, Youngwon Lee, Kija Lee
This study describes magnetic resonance imaging findings and changes in lateral ventricular size according to time passage of canine ischemic stroke model. T1- and T2-weighted (T1W, T2W) imaging and fluid-attenuated inversion recovery (FLAIR) sequence were performed at 3 h and 3, 8, and 35 days after brain infarct induction. Diffusion-weighted imaging (DWI) and apparent diffusion coefficient mapping were obtained at 8 and 35 days. A total of 29 brain lesions were induced successfully in 12 of 14 beagle dogs...
July 10, 2017: Journal of Veterinary Science
https://www.readbyqxmd.com/read/28687453/cerebellar-stroke-presenting-with-isolated-dizziness-brain-mri-in-136-patients
#4
Michael D Perloff, Nimesh S Patel, Carlos S Kase, Anuja U Oza, Barbara Voetsch, Jose R Romero
OBJECTIVE: To evaluate occurrence of cerebellar stroke in Emergency Department (ED) presentations of isolated dizziness (dizziness with a normal exam and negative neurological review of systems). METHODS: A 5-year retrospective study of ED patients presenting with a chief complaint of "dizziness or vertigo", without other symptoms or signs in narrative history or on exam to suggest a central nervous system lesion, and work-up included a brain MRI within 48h. Patients with symptoms commonly peripheral in etiology (nystagmus, tinnitus, gait instability, etc...
June 22, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28687423/an-increase-of-sigma-1-receptor-in-the-penumbra-neuron-after-acute-ischemic-stroke
#5
Xiaotian Zhang, Fangfang Wu, Yun Jiao, Tianyu Tang, Li Yang, Chunqiang Lu, Yanhong Zhang, Yuan Zhang, Ying Bai, Jie Chao, Gaojun Teng, Honghong Yao
BACKGROUND: Penumbra salvage from infarction by early reperfusion within the time window is the target of acute ischemic stroke therapies. Although the penumbral imaging is potently usable in clinic trial, additional work needs to be performed to advancing the field with better-defined, evaluated, and validated imaging measures. METHODS: Mice were subjected to permanent stroke by right middle cerebral artery (MCA) occlusion. Multimodel magnetic resonance imaging (MRI) method was assessed to define the penumbra as that brain region in which the perfusion and diffusion-weighted MR images are mismatched (perfusion-weighted imaging [PWI]-diffusion-weighted imaging [DWI] mismatch)...
July 4, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28680785/a-case-report-of-probable-sporadic-creutzfeldt-jakob-disease-how-to-approach-early-diagnosis
#6
Bowei Tan, Carlos Morales Mangual, Iftekhar Mahmud, Nosakhare D Tongo, Larisa Mararenko, Arthur Kay
Sporadic Creutzfeldt-Jakob disease (sCJD) is a rare and fatal spongiform encephalopathy characterized by rapidly progressive dementia and myoclonus. The rarity of this disease and varied initial symptoms make the early diagnosis fairly challenging. Here, we present a case initially admitted for confusion and bizarre behaviors. She had acute deterioration of mental status, akinetic mutism, and myoclonus jerks four weeks later. Cerebrospinal fluid (CSF) analysis was positive for protein 14-3-3. Brain magnetic resonance imaging (MRI) showed hyperintensities in the bilateral cortex, basal ganglia, and thalami in diffusion-weighted imaging (DWI)...
May 30, 2017: Curēus
https://www.readbyqxmd.com/read/28675542/white-matter-maturation-in-the-neonatal-brain-is-predictive-of-school-age-cognitive-capacities-in-children-born-very-preterm
#7
Kristin Keunen, Manon J Benders, Alexander Leemans, Petronella C Fieret-Van Stam, Lianne H Scholtens, Max A Viergever, René S Kahn, Floris Groenendaal, Linda S de Vries, Martijn P van den Heuvel
AIM: To investigate the association between white matter organization in the neonatal brain and cognitive capacities at early school age in children born very preterm. METHOD: Thirty children born very preterm (gestational age median 27.5wks, interquartile range [IQR] 25.5-29.5; 18 males, 12 females) were included in this retrospective observational cohort study. Diffusion-weighted imaging (DWI) had been performed on a 3T system in the neonatal period (median 41...
July 4, 2017: Developmental Medicine and Child Neurology
https://www.readbyqxmd.com/read/28670271/white-matter-tract-integrity-in-alzheimer-s-disease-vs-late-onset-bipolar-disorder-and-its-correlation-with-systemic-inflammation-and-oxidative-stress-biomarkers
#8
Ariadna Besga, Darya Chyzhyk, Itxaso Gonzalez-Ortega, Jon Echeveste, Marina Graña-Lecuona, Manuel Graña, Ana Gonzalez-Pinto
Background: Late Onset Bipolar Disorder (LOBD) is the development of Bipolar Disorder (BD) at an age above 50 years old. It is often difficult to differentiate from other aging dementias, such as Alzheimer's Disease (AD), because they share cognitive and behavioral impairment symptoms. Objectives: We look for WM tract voxel clusters showing significant differences when comparing of AD vs. LOBD, and its correlations with systemic blood plasma biomarkers (inflammatory, neurotrophic factors, and oxidative stress)...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28659776/cholinergic-potentiation-and-audiovisual-repetition-imitation-therapy-improve-speech-production-and-communication-deficits-in-a-person-with-crossed-aphasia-by-inducing-structural-plasticity-in-white-matter-tracts
#9
Marcelo L Berthier, Irene De-Torres, José Paredes-Pacheco, Núria Roé-Vellvé, Karl Thurnhofer-Hemsi, María J Torres-Prioris, Francisco Alfaro, Ignacio Moreno-Torres, Diana López-Barroso, Guadalupe Dávila
Donepezil (DP), a cognitive-enhancing drug targeting the cholinergic system, combined with massed sentence repetition training augmented and speeded up recovery of speech production deficits in patients with chronic conduction aphasia and extensive left hemisphere infarctions (Berthier et al., 2014). Nevertheless, a still unsettled question is whether such improvements correlate with restorative structural changes in gray matter and white matter pathways mediating speech production. In the present study, we used pharmacological magnetic resonance imaging to study treatment-induced brain changes in gray matter and white matter tracts in a right-handed male with chronic conduction aphasia and a right subcortical lesion (crossed aphasia)...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28634311/-bevacizumab-related-hyperintense-lesions-on-diffusion-weighted-imaging-at-different-locations-in-a-patient-with-malignant-glioma
#10
Shinya Oshiro, Naoki Wakuta, Shinichi Kawai, Koichi Miki, Yutaka Shigemori
We report the case of a 60-year-old man who first presented with transient difficulty of word recall. Subsequent MRI revealed an invasive brain tumor in the left frontal lobe. The patient underwent open biopsy, and diffuse astrocytoma(WHO grade II)was diagnosed. However, the malignant potential of this tumor was not particularly low because of a few enhancement on preoperative evaluation, and radiation therapy was initially performed. Four months after ending irradiation, temozolomide treatment was introduced for tumor regrowth...
June 2017: No Shinkei Geka. Neurological Surgery
https://www.readbyqxmd.com/read/28629955/correlation-study-between-dki-and-conventional-dwi-in-brain-and-head-and-neck-tumors
#11
Silvia Minosse, Simona Marzi, Francesca Piludu, Antonello Vidiri
PURPOSE: To investigate the relationship between the Diffusion Kurtosis Imaging (DKI) parameters and conventional metrics provided by Diffusion-weighted imaging (DWI) in patients affected by Brain or Head and Neck (HN) cancer. METHODS: Ten patients affected by brain tumor and nine patients with HN tumor underwent a pre-treatment MR examination at 3 T. The largest tumor section was manually contoured by two expert neuroradiologists. The apparent diffusion coefficient (Dapp) and apparent diffusional kurtosis (Kapp) parameters were determined at the voxel level by using the DKI model, and compared to the apparent diffusion coefficient (ADC) and the tissue diffusion coefficient (Dmono) obtained from mono-exponential fitting methods...
June 16, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28619837/differentiation-between-treatment-induced-necrosis-and-recurrent-tumors-in-patients-with-metastatic-brain-tumors-comparison-among-11-c-methionine-pet-fdg-pet-mr-permeability-imaging-and-mri-adc-preliminary-results
#12
N Tomura, M Kokubun, T Saginoya, Y Mizuno, Y Kikuchi
BACKGROUND AND PURPOSE: In patients with metastatic brain tumors after gamma knife radiosurgery, the superiority of PET using (11)C-methionine for differentiating radiation necrosis and recurrent tumors has been accepted. To evaluate the feasibility of MR permea- bility imaging, it was compared with PET using (11)C-methionine, FDG-PET, and DWI for differentiating radiation necrosis from recurrent tumors. MATERIALS AND METHODS: The study analyzed 18 lesions from 15 patients with metastatic brain tumors who underwent gamma knife radiosurgery...
June 15, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28615334/diffusion-weighted-tractography-in-the-common-marmoset-monkey-at-9-4-t
#13
David J Schaeffer, Ramina Adam, Kyle M Gilbert, Joseph S Gati, Alex X Li, Ravi S Menon, Stefan Everling
The common marmoset (Callithrix jacchus) is a small New World primate that is becoming increasingly popular in the neurosciences as an animal model of preclinical human disease. With several major disorders characterized by alterations in neural white matter (e.g., multiple sclerosis, Alzheimer's, schizophrenia) proposed to be transgenically modelled using marmosets, the ability to reliably isolate and characterize major white matter fiber tracts with MRI will be of utility for evaluating structural brain changes related to disease processes and symptomatology...
June 14, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28608161/the-diagnostic-value-of-high-frequency-power-based-diffusion-weighted-imaging-in-prediction-of-neuroepithelial-tumour-grading
#14
Zhiye Chen, Peng Zhou, Bin Lv, Mengqi Liu, Yan Wang, Yulin Wang, Xin Lou, Qiuping Gui, Huiguang He, Lin Ma
OBJECTIVES: To retrospectively evaluate the diagnostic value of high-frequency power (HFP) compared with the minimum apparent diffusion coefficient (MinADC) in the prediction of neuroepithelial tumour grading. METHODS: Diffusion-weighted imaging (DWI) data were acquired on 115 patients by a 3.0-T MRI system, which included b0 images and b1000 images over the whole brain in each patient. The HFP values and MinADC values were calculated by an in-house script written on the MATLAB platform...
June 12, 2017: European Radiology
https://www.readbyqxmd.com/read/28601503/cortical-magnetization-transfer-abnormalities-and-connectome-dysconnectivity-in-schizophrenia
#15
Yongbin Wei, Guusje Collin, René C W Mandl, Wiepke Cahn, Kristin Keunen, Ruben Schmidt, René S Kahn, Martijn P van den Heuvel
Macroscale dysconnectivity in schizophrenia is associated with neuropathological abnormalities. The extent to which alterations in cortical myelination as revealed in vivo by magnetization transfer ratio (MTR) are related to macroscale dysconnectivity remains unknown. We acquired magnetization transfer imaging (MTI) data and diffusion weighted imaging (DWI) data from 78 schizophrenia patients and 93 healthy controls for MTR extraction and connectome reconstruction to examine the possible link between cortical myelination and macroscale dysconnectivity...
June 7, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28598225/a-novel-voxel-wise-lesion-segmentation-technique-on-3-0-t-diffusion-mri-of-hyperacute-focal-cerebral-ischemia-at-1%C3%A2-h-after-permanent-mcao-in-rats
#16
Chi-Hoon Choi, Kyung Sik Yi, Sang-Rae Lee, Youngjeon Lee, Chang-Yeop Jeon, Jinwoo Hwang, Chulhyun Lee, Sung Sik Choi, Hong Jun Lee, Sang-Hoon Cha
To assess hyperacute focal cerebral ischemia in rats on 3.0-Tesla diffusion-weighted imaging (DWI), we developed a novel voxel-wise lesion segmentation technique that overcomes intra- and inter-subject variation in apparent diffusion coefficient (ADC) distribution. Our novel technique involves the following: (1) intensity normalization including determination of the optimal type of region of interest (ROI) and its intra- and inter-subject validation, (2) verification of focal cerebral ischemic lesions at 1 h with gross and high-magnification light microscopy of hematoxylin-eosin (H&E) pathology, (3) voxel-wise segmentation on ADC with various thresholds, and (4) calculation of dice indices (DIs) to compare focal cerebral ischemic lesions at 1 h defined by ADC and matching H&E pathology...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28596990/magnetic-resonance-imaging-of-cerebral-malaria-patients-reveals-distinct-pathogenetic-processes-in-different-parts-of-the-brain
#17
Sanjib Mohanty, Laura A Benjamin, Megharay Majhi, Premanand Panda, Sam Kampondeni, Praveen K Sahu, Akshaya Mohanty, Kishore C Mahanta, Rajyabardhan Pattnaik, Rashmi R Mohanty, Sonia Joshi, Anita Mohanty, Ian W Turnbull, Arjen M Dondorp, Terrie E Taylor, Samuel C Wassmer
The mechanisms underlying the rapidly reversible brain swelling described in patients with cerebral malaria (CM) are unknown. Using a 1.5-Tesla (T) magnetic resonance imaging (MRI) scanner, we undertook an observational study in Rourkela, India, of 11 Indian patients hospitalized with CM and increased brain volume. Among the 11 cases, there were 5 adults and 6 children. All patients had reduced consciousness and various degrees of cortical swelling at baseline. The latter was predominately posterior in distribution...
May 2017: MSphere
https://www.readbyqxmd.com/read/28596202/persistent-lesion-hyperintensity-on-brain-diffusion-weighted-mri-is-an-early-sign-of-intravascular-lymphoma
#18
Takashi Kageyama, Haruo Yamanaka, Fumihiko Nakamura, Toshihiko Suenaga
A 63-year-old man presented with right-sided hemianopia and unsteady gait. Brain MRI revealed multiple hyperintense infarct-like lesions on diffusion-weighted images (DWI). Hyperintensity persisted in some of these lesions even after 6 weeks, although his symptoms were ameliorated then. The patient developed episodic dizziness and a transient event of apraxia at 18 weeks after the first episode. Brain MRI revealed additional hyperintense lesions on DWI, which persisted even after 7 weeks. Eventually, the patient manifested cauda equina syndrome 39 weeks after the first episode...
June 8, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28596191/perfusion-mr-imaging-using-a-3d-pulsed-continuous-arterial-spin-labeling-method-for-acute-cerebral-infarction-classified-as-branch-atheromatous-disease-involving-the-lenticulostriate-artery-territory
#19
Y Shinohara, A Kato, K Kuya, K Okuda, M Sakamoto, H Kowa, T Ogawa
BACKGROUND AND PURPOSE: Branch atheromatous disease is a stroke subtype considered a risk factor for early neurologic deterioration. Meanwhile, crossed cerebellar diaschisis is thought to be influenced by the degree and location of supratentorial perfusion abnormalities and is associated with the clinical outcome in the case of an ischemic stroke. In this article, our aim was to clarify the utility of using a whole-brain 3D pulsed continuous arterial spin-labeling method as an imaging biomarker for predicting neurologic severity in branch atheromatous disease...
June 8, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28559827/pure-amorphagnosia-without-tactile-object-agnosia
#20
Shinichirou Kubota, Mai Yamada, Hideyo Satoh, Akira Satoh, Mitsuhiro Tsujihata
A 54-year-old female showed amorphagnosia without ahylognosia and tactile agnosia 40 days after the onset of right cerebral infarction. Her basic somatosensory functions were normal. The appreciation of substance qualities (hylognosia) was preserved, but the patient's inability to recognize the size and shape (morphagnosia) was confined to 2- and 3-dimensional shapes (amorphagnosia) in the left hand. However, the patient's ability to recognize real daily objects was well preserved. Brain MRI after admission showed ischemic lesions confined to the right pre- and postcentral gyri and the medial frontal cortex on DWI and FLAIR images...
January 2017: Case Reports in Neurology
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