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https://www.readbyqxmd.com/read/29786594/-brain-microbleeds-definition-pathophysiology-and-the-consequences
#1
Marek Mazurek, Ewa Papuć, Konrad Rejdak
Brain microbleeds are defined as small, circular hypointense changes in T2-sequensec of brain MRI, well demarcated from the surrounding tissue. They represent the phagocytized products of blood distribution extravasated from pathologically altered vessels. The echo-T2-dependent gradient (GRE) and magnetic susceptibility testing (SWI) sequences are usually used to visualize them. The pathogenesis of microbleeds very complex but angiopathy associated with arterial hypertension and cerebral amyloid angiopathy play a special role...
2018: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/29785932/cortical-thickness-correlates-of-minor-neurological-signs-in-patients-with-first-episode-psychosis
#2
Simone Ciufolini, Maria Francesca Ponteduro, Tiago Reis-Marques, Heather Taylor, Valeria Mondelli, Carmine M Pariante, Stefania Bonaccorso, Raymond Chan, Andy Simmons, Anthony David, Marta Di Forti, Robin M Murray, Paola Dazzan
Neurological soft signs (NSS) are subtle abnormalities of motor and sensory function that are present in the absence of localized brain pathological lesions. In psychoses they have been consistently associated with a distinct pattern of cortical and subcortical brain structural alterations at the level of the heteromodal cortex and basal ganglia. However, a more specific and accurate evaluation of the cytoarchitecture of the cortical mantle could further advance our understanding of the neurobiological substrate of psychosis...
May 18, 2018: Schizophrenia Research
https://www.readbyqxmd.com/read/29785469/early-detection-of-cerebral-infarction-after-focal-ischemia-using-a-new-mri-indicator
#3
Yukako Nakajo, Qiang Zhao, Jun-Ichiro Enmi, Hidehiro Iida, Jun C Takahashi, Hiroharu Kataoka, Keiko Yamato, Hiroji Yanamoto
Prolongation of the T2 relaxation time, an increase in T2-weighted signal intensity (T2-SI), and a decrease in the apparent diffusion coefficient (ADC) calculated from diffusion-weighted images (DWI) on magnetic resonance imaging (MRI) are conventional indicators of the vasogenic (interstitial) or cytotoxic (cellular) cerebral edema that develops after ischemic stroke. However, these parameters obtained on stroke imaging have not given us a precise threshold at which we can determine the viability or vulnerability of the tissue, allowing us to decide on an intervention that will help reversible tissue in the acute phase...
May 21, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29785359/white-matter-microstructure-white-matter-lesions-and-hypertension-an-examination-of-early-surrogate-markers-of-vascular-related-brain-change-in-midlife
#4
Thaddeus Haight, R Nick Bryan, Guray Erus, Meng-Kang Hsieh, Christos Davatzikos, Ilya Nasrallah, Mark D'Esposito, David R Jacobs, Cora Lewis, Pamela Schreiner, Stephen Sidney, Osorio Meirelles, Lenore J Launer
Objective: We examined imaging surrogates of white matter microstructural abnormalities which may precede white matter lesions (WML) and represent a relevant marker of cerebrovascular injury in adults in midlife. Methods: In 698 community-dwelling adults (mean age 50 years ±3.5 SD) from the Coronary Artery Risk Development in Young Adults (CARDIA) Brain MRI sub-study, WML were identified on structural MR and fractional anisotropy (FA), representing WM microstructural integrity, was derived using Diffusion Tensor Imaging...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/29785317/a-rare-case-of-penile-metastases-as-a-harbinger-of-primary-pulmonary-adenosquamous-carcinoma
#5
Partha Hota, Tejas N Patel, Xiaofeng Zhao, Carrie Schneider, Omar Agosto
Although lung cancer has a high propensity for distant metastatic disease, penile metastases from primary lung neoplasms are considered particularly rare. A 71-year-old male presented to our hospital with a rapidly enlarging hard palpable penile mass. MR imaging demonstrated two penile masses centered in the left and right corpus cavernosa. Subsequent CT imaging revealed a spiculated pulmonary mass in the right upper lobe with PET/CT, MRI, and surgical exploration, demonstrating evidence of metastases to the left adrenal gland, right subscapularis muscle, brain, and small bowel...
2018: Case Reports in Radiology
https://www.readbyqxmd.com/read/29781383/preferential-spinal-cord-volume-loss-in-primary-progressive-multiple-sclerosis
#6
Charidimos Tsagkas, Stefano Magon, Laura Gaetano, Simon Pezold, Yvonne Naegelin, Michael Amann, Christoph Stippich, Philippe Cattin, Jens Wuerfel, Oliver Bieri, Till Sprenger, Ludwig Kappos, Katrin Parmar
BACKGROUND: Little is known on longer term changes of spinal cord volume (SCV) in primary progressive multiple sclerosis (PPMS). OBJECTIVE: Longitudinal evaluation of SCV loss in PPMS and its correlation to clinical outcomes, compared to relapse-onset multiple sclerosis (MS) subtypes. METHODS: A total of 60 MS age-, sex- and disease duration-matched patients (12 PPMS, each 24 relapsing-remitting (RRMS) and secondary progressive MS (SPMS)) were analysed annually over 6 years of follow-up...
May 1, 2018: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/29781194/paraneoplastic-autoimmune-encephalitis-associated-with-pleomorphic-lung-carcinoma-an-autopsy-case-report
#7
Takashi Ando, Yoji Goto, Kazuo Mano, Fumio Nomura, Masako Kurashige, Masafumi Ito, Maya Mimuro, Yasushi Iwasaki, Masahisa Katsuno, Mari Yoshida
A 64-year-old man was admitted with acute onset disturbed consciousness. Cerebrospinal fluid analysis revealed pleocytosis and elevated protein, with negative cultures and PCR. Serum antibodies for autoimmune encephalitis were also negative. Brain magnetic resonance imaging (MRI) was unremarkable, but whole-body CT scan showed a tumor in the left lower lung lobe. Bronchial brush cytology demonstrated clusters of malignant cells, and 18 F-fluorodeoxyglucose positron emission tomography showed multiple lesions and increased uptake in the lung tumor...
May 20, 2018: Neuropathology: Official Journal of the Japanese Society of Neuropathology
https://www.readbyqxmd.com/read/29781154/neuroglial-ectopia-of-the-vestibular-nerve-masquerading-as-a-vestibular-schwannoma-a-case-report
#8
John P Sheppard, Carlito Lagman, Thien Nguyen, Négar Khanlou, Quinton Gopen, Isaac Yang
Neuroglial ectopia is a rare entity of undetermined clinical significance. Here, we report a unique case of neuroglial ectopia of the vestibular nerve. A 27-year-old pharmacy student with a previous radiological diagnosis of vestibular schwannoma presented to our clinic for surgical evaluation. Magnetic resonance imaging (MRI) of the brain revealed a 17-mm T1 hypo- to isointense, T2 iso- to hyperintense, poorly enhancing left cerebellopontine angle mass extending into the left internal auditory canal compatible by imaging with a vestibular schwannoma...
May 20, 2018: Neuropathology: Official Journal of the Japanese Society of Neuropathology
https://www.readbyqxmd.com/read/29780226/cerebral-border-zone-infarction-an-etiological-study
#9
Tarek Mohammed El-Gammal, Wafik Said Bahnasy, Osama Abd Allah Ragab, Ayman Mohammed Al-Malt
Background: Border zone infarcts (BZI) are ischemic lesions at the junction between two main arterial territories which may be either cortical or internal BZI. Methods: This study was conducted on 76 cerebral BZI patients and 20 healthy control subjects. Patients were divided to group I included 26 internal BZI, group II included 19 cortical BZI and group III included 21 mixed internal/cortical BZI patients. Included subjects were submitted to neurological examination, laboratory investigations, ECG, echocardiogram, brain CT and/or MRI and extra and intracranial blood vessels imaging by duplex and CT angiography...
2018: The Egyptian journal of neurology, psychiatry and neurosurgery
https://www.readbyqxmd.com/read/29778285/subcutaneous-tissue-metastasis-from-glioblastoma-multiforme-a-case-report-and-review-of-the-literature
#10
Natalia Frade Porto, Juan Delgado Fernández, María de Los Ángeles García Pallero, Juan Ramón Penanes Cuesta, Paloma Pulido Rivas, Ricardo Gil Simoes
Glioblastoma multiforme is the most common primary brain tumor, despite an aggressive clinical course, less than 2% of patients develop extraneural metastasis. We present a 72-year-old male diagnosed with a right temporal glioblastoma due to headache. He underwent total gross resection surgery and after that the patient was treated with adyuvant therapy. Five months after the patient returned with trigeminal neuralgia, and MRI showed an infratemporal cranial mass which infiltrates masticator space, the surrounding bone, the temporal muscle and superior cervical and parotid lymph nodes...
May 16, 2018: Neurocirugía
https://www.readbyqxmd.com/read/29777892/surgically-treated-de-novo-cervico-medullary-arachnoid-cyst-in-a-symptomatic-adult-patient
#11
William Clifton, Gazanfar Rahmathulla, Kourosh Tavanaiepour, Dunbar Alcindor, George Jakubek, Daryoush Tavanaiepour
Arachnoid cysts are a relatively common finding in adult patients, especially with the advent of advanced imaging techniques. The overall incidence ranges from 1-2%, and the majority are clinically silent1,2 . Arachnoid cysts are postulated to arise by congenital anomalies or trauma1 . De novo formation of arachnoid cysts has been reported, but is exceptionally rare and mostly found in the pediatric population after head trauma3-5 . There have only been two reported cases of symptomatic de novo arachnoid cyst formation in adult patients to date, both with histories of head trauma6,7 ...
May 16, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29777360/crossed-aphasia-following-cerebral-infarction-in-a-right-handed-patient-with-atypical-cerebral-language-dominance
#12
Xiaoping Tan, Yang Guo, Saihong Dun, Hongzan Sun
OBJECTIVE: Crossed aphasia (CA), usually referred to as an acquired language disturbance, is caused by a lesion in the cerebral hemisphere ipsilateral to the dominant hand, and the exact mechanism is not clear. The development of handedness is influenced by education and training and the impact of habitualization, while language is more susceptible to the impact of speech habits, and it is not absolutely accurate to judge cerebral language dominance by the degree of hand preference. METHODS: We describe a case of CA after right hemispheric stroke in a right-handed patient with atypical language dominance and attempt to analyze the mechanism of CA based on functional imaging methods, including arterial spin labeling (ASL) and positron emission tomography/magnetic resonance imaging (PET-MRI)...
May 18, 2018: Journal of Neurology
https://www.readbyqxmd.com/read/29774180/survival-prediction-based-on-qualitative-mri-diffusion-signature-in-patients-with-recurrent-high-grade-glioma-treated-with-bevacizumab
#13
Pradeep Goyal, Mary Tenenbaum, Sonali Gupta, Puneet S Kochar, Alok A Bhatt, Manisha Mangla, Yogesh Kumar, Rajiv Mangla
Background: Bevacizumab was approved by the FDA for the treatment of recurrent or progressive glioblastoma (GBM). Imaging responses are typically assessed by gadolinium-enhanced MRI. We sought to determine the significance of qualitative diffusion signature (manifest as variable degree of dark signal) on ADC maps in recurrent gliomas after treatment with bevacizumab. Methods: We performed an institutional review board (IRB) approved retrospective study on patients who underwent MRI of the brain after 8 weeks of receiving bevacizumab for recurrent glioma...
April 2018: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/29773567/balanced-steady-state-free-precession-sequence-ciss-fiesta-3d-driven-equilibrium-radiofrequency-reset-pulse-increases-the-diagnostic-yield-for-spinal-drop-metastases-in-children-with-brain-tumors
#14
K Buch, P Caruso, D Ebb, S Rincon
BACKGROUND AND PURPOSE: Identification of spinal drop metastases is important in the staging and management of pediatric patients with primary brain tumors. Our aim was to assess the diagnostic utility of the balanced steady-state free precession (bSSFP) sequence (CISS/FIESTA/3D driven equilibrium radiofrequency reset pulse) for the detection of spinal drop metastases in pediatric patients with primary intracranial tumors. MATERIALS AND METHODS: This was a retrospective study of 44 pediatric patients with primary intracranial tumors undergoing MR imaging spine evaluation for drop metastases before radiation treatment...
May 17, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29772320/predictive-factors-of-silent-brain-infarcts-after-asymptomatic-carotid-endarteriectomy
#15
Rémy Pascot, Benjamin Parat, Yann Le Teurnier, Gilles Godet, Jean-Yves Gauvrit, Yann Gouëffic, Eric Steinmetz, Alain Cardon, Adrien Kaladji
BACKGROUND: The optimization of medical treatment regularly challenges the role of carotid surgery for asymptomatic patients. Current research seeks to determine which of these patients will benefit most from surgery. The goal of this study was to identify in a multi-center study, using MRI, the risk factors for postoperative silent cerebral ischemic lesions after carotid surgery for asymptomatic stenosis METHODS: The multicenter, retrospective study included patients with asymptomatic severe carotid stenosis suitable for surgical treatment and who did not have a history of cerebral ischemia...
May 14, 2018: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29769374/better-diet-quality-relates-to-larger-brain-tissue-volumes-the-rotterdam-study
#16
Pauline H Croll, Trudy Voortman, M Arfan Ikram, Oscar H Franco, Josje D Schoufour, Daniel Bos, Meike W Vernooij
OBJECTIVE: To investigate the relation of diet quality with structural brain tissue volumes and focal vascular lesions in a dementia-free population. METHODS: From the population-based Rotterdam Study, 4,447 participants underwent dietary assessment and brain MRI scanning between 2005 and 2015. We excluded participants with an implausible energy intake, prevalent dementia, or cortical infarcts, leaving 4,213 participants for the current analysis. A diet quality score (0-14) was calculated reflecting adherence to Dutch dietary guidelines...
May 16, 2018: Neurology
https://www.readbyqxmd.com/read/29768295/requirement-for-head-magnetic-resonance-imaging-in-children-who-present-to-the-emergency-department-with-acute-nontraumatic-visual-disturbance
#17
Jeong-Yong Lee, Jung-Heon Kim, Hyung-Rae Cho, Jong-Seung Lee, Jeong-Min Ryu, Mi-Sun Yum, Tae-Sung Ko
OBJECTIVES: This study aimed to investigate the clinical features and head magnetic resonance imaging (MRI) findings in children who presented to the emergency department with acute nontraumatic visual disturbance and to study related clinical factors for discovering positive lesions on head MRI. METHODS: We performed a retrospective study of 1-month to 15-year-old children who underwent head MRI as an evaluation for acute nontraumatic visual disturbance as a chief complaint in our pediatric emergency department between March 2010 and March 2015...
May 15, 2018: Pediatric Emergency Care
https://www.readbyqxmd.com/read/29766933/corticospinal-tract-changes-in-acute-brainstem-ischemic-stroke-patients-a-diffusion-kurtosis-imaging-study
#18
Huiyou Chen, Liang Jiang, Hong Zhang, Ying-Dong Zhang, Wen Geng, Yuan Feng, Qian Chen, Yu-Chen Chen, Xindao Yin
Purpose: The present study aimed to investigate the corticospinal tract (CST) changes in patients with brainstem ischemic stroke by using the diffusion kurtosis imaging (DKI) approach.. Materials and Methods: Twenty-one patients with brainstem stroke and 21 group-matched healthy controls underwent brain DKI with 3.0 T magnetic resonance imaging (MRI). The DKI was obtained by using three b values of 0, 1,000, 2,000 s/mm2 with 15 diffusion directions. Regions of interest (ROIs) were placed at four levels: the pons, posterior limb of the internal capsule (PLIC), corona radiata, and precentral gyrus...
May 2018: Neurology India
https://www.readbyqxmd.com/read/29766384/increased-functional-meg-connectivity-as-a-hallmark-of-mri-negative-focal-and-generalized-epilepsy
#19
Yiwen Li Hegner, Justus Marquetand, Adham Elshahabi, Silke Klamer, Holger Lerche, Christoph Braun, Niels K Focke
Epilepsy is one of the most prevalent neurological diseases with a high morbidity. Accumulating evidence has shown that epilepsy is an archetypical neural network disorder. Here we developed a non-invasive cortical functional connectivity analysis based on magnetoencephalography (MEG) to assess commonalities and differences in the network phenotype in different epilepsy syndromes (non-lesional/cryptogenic focal and idiopathic/genetic generalized epilepsy). Thirty-seven epilepsy patients with normal structural brain anatomy underwent a 30-min resting state MEG measurement with eyes closed...
May 15, 2018: Brain Topography
https://www.readbyqxmd.com/read/29761357/classifying-brain-metastases-by-their-primary-site-of-origin-using-a-radiomics-approach-based-on-texture-analysis-a-feasibility-study
#20
Rafael Ortiz-Ramón, Andrés Larroza, Silvia Ruiz-España, Estanislao Arana, David Moratal
OBJECTIVE: To examine the capability of MRI texture analysis to differentiate the primary site of origin of brain metastases following a radiomics approach. METHODS: Sixty-seven untreated brain metastases (BM) were found in 3D T1-weighted MRI of 38 patients with cancer: 27 from lung cancer, 23 from melanoma and 17 from breast cancer. These lesions were segmented in 2D and 3D to compare the discriminative power of 2D and 3D texture features. The images were quantized using different number of gray-levels to test the influence of quantization...
May 14, 2018: European Radiology
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