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Registros recuperados: 25
Primeira ... 12 ... Última
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Abnormalities of hippocampal signal intensity in patients with familial mesial temporal lobe epilepsy BJMBR
Coan,A.C.; Kobayashi,E.; Lopes-Cendes,I.; Li,L.M.; Cendes,F..
Mesial temporal lobe epilepsy (MTLE) is associated with hippocampal atrophy and hippocampal signal abnormalities. In our series of familial MTLE (FMTLE), we found a high proportion of hippocampal abnormalities. To quantify signal abnormalities in patients with FMTLE we studied 152 individuals (46 of them asymptomatic) with FMTLE. We used NIH-Image® for volumetry and signal quantification in coronal T1 inversion recovery and T2 for all cross-sections of the hippocampus. Values diverging by 2 or more SD from the control mean were considered abnormal. T2 hippocampal signal abnormalities were found in 52% of all individuals: 54% of affected subjects and 48% of asymptomatic subjects. T1 hippocampal signal changes were found in 34% of all individuals: 42.5% of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hippocampal signal abnormalities; Familial mesial temporal lobe epilepsy; Hippocampal volumetry; Magnetic resonance imaging.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000600007
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Cerebral blood flow and vasoreactivity in aging: an arterial spin labeling study BJMBR
Leoni,R.F.; Oliveira,I.A.F.; Pontes-Neto,O.M.; Santos,A.C.; Leite,J.P..
Regional cerebral blood flow (CBF) and cerebrovascular reactivity (CVR) in young and elderly participants were assessed using pulsed arterial spin labeling (ASL) and blood oxygenation level-dependent (BOLD) magnetic resonance imaging (MRI) techniques in combination with inhalation of CO2. Pulsed ASL and BOLD-MRI were acquired in seventeen asymptomatic volunteers (10 young adults, age: 30±7 years; 7 elderly adults, age: 64±8 years) with no history of diabetes, hypertension, and neurological diseases. Data from one elderly participant was excluded due to the incorrigible head motion. Average baseline CBF in gray matter was significantly reduced in elderly (46±9 mL·100 g-1·min-1) compared to young adults (57±8 mL·100 g-1·min-1; P=0.02). Decreased pulsed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Arterial spin labeling; Blood oxygenation level-dependent contrast; Cerebral blood flow; Cerebrovascular reactivity; Hypercapnia; Magnetic resonance imaging.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000400701
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Clinico-Radiographic Examination of Odontogenic Myxoma with Displacement of Unerupted Upper Third Molar: Review of the Literature International Journal of Morphology
Altug,Hasan Ayberk; Gulses,Aydin; Sencimen,Metin.
Odotogenic myxoma is a benign tumor which presents in 3% to 6% of all odontogenic tumors. According to the WHO classification, multiple radiolucent areas of varying size, separated by straight or curved bony septa with poorly defined borders are the radiologic characteristics of the condition. We report the case of maxillary odontogenic myxoma in a 21 year old man. The radiological feature of the current case was interesting, due to the size of the lesion and severe displacement of the upper third molar.
Tipo: Journal article Palavras-chave: Odontogenic myxoma; Orthopantomography; Computed tomography; Magnetic resonance imaging; Impacted molar; Cyst.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300045
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Compensatory enlargement of human coronary arteries identified by magnetic resonance imaging BJMBR
Bertini,P.J.; Parga,J.R.; Chagas,A.C.P.; Rochitte,C.E.; Ávila,L.F.; Favarato,D.; Luz,P.L. da.
The aim of the present study was to evaluate the role of magnetic resonance imaging (MRI) for the non-invasive detection of coronary abnormalities and specifically the remodeling process in patients with coronary artery disease (CAD). MRI was performed in 10 control healthy subjects and 26 patients with angiographically proven CAD of the right coronary (RCA) or left anterior descending (LAD) artery; 23 patients were within two months of acute coronary syndromes, and 3 had stable angina with a positive test for ischemia. Wall thickness (WT), vessel wall area (VWA), total vessel area (TVA), and luminal area (LA) were measured. There were significant increases in WT (mean ± SEM, RCA: 2.62 ± 0.75 vs 0.53 ± 0.15 mm; LAD: 2.21 ± 0.69 vs 0.62 ± 0.24 mm) and in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coronary disease; Coronary remodeling; Magnetic resonance imaging.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000500002
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Computed tomography and magnetic resonance imaging findings for the initial stage of equine temporohyoid osteoarthropathy in a thoroughbred foal OAK
Inui, Tomohiro; Yamada, Kazutaka; Itoh, Megumi; Yanagawa, Masashi; Higuchi, Tohru; Watanabe, Akiko; Imamura, Yui; Urabe, Mako; Sasaki, Naoki.
Temporohyoid osteoarthropathy (THO) is characterized by progressive osseous proliferation of the stylohyoid and petrous temporal bones. Generally, diagnosis is confirmed by guttural pouch endoscopy and skull radiography. In the present case, computed tomography (CT) and magnetic resonance imaging (MRI) were performed in a 6-month-old Thoroughbred foal showing signs of head tilt and unilateral ear droop, consistent with the presence of a vestibular disease and unilateral facial paralysis. CT revealed bony fusion and proliferation of the right temporohyoid joint, while MRI revealed that otitis media was responsible for THO. In conclusion, this report suggests that CT and MRI provide a more concrete diagnosis and better understandings of the mechanism of THO...
Palavras-chave: Computed tomography; Magnetic resonance imaging; Otitis media; Temporohyoid osteoarthropathy.
Ano: 2017 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4571
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Correlation between voxel based morphometry and manual volumetry in magnetic resonance images of the human brain Anais da ABC (AABC)
Uchida,Ricardo R.; Del-Ben,Cristina M.; Araújo,David; Busatto-Filho,Geraldo; Duran,Fábio L.S.; Crippa,José A.S.; Graeff,Frederico G..
This is a comparative study between manual volumetry (MV) and voxel based morphometry (VBM) as methods of evaluating the volume of brain structures in magnetic resonance images. The volumes of the hippocampus and the amygdala of 16 panic disorder patients and 16 healthy controls measured through MV were correlated with the volumes of gray matter estimated by optimized modulated VBM. The chosen structures are composed almost exclusively of gray matter. Using a 4 mm Gaussian filter, statistically significant clusters were found bilaterally in the hippocampus and in the right amygdala in the statistical parametric map correlating with the respective manual volume. With the conventional 12 mm filter,a significant correlation was found only for the right...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Magnetic resonance imaging; Manual volumetry; Voxel based morphometry.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100010
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Decreased left temporal lobe volume of panic patients measured by magnetic resonance imaging BJMBR
Uchida,R.R.; Del-Ben,C.M.; Santos,A.C.; Araújo,D.; Crippa,J.A.; Guimarães,F.S.; Graeff,F.G..
Reported neuroimaging studies have shown functional and morphological changes of temporal lobe structures in panic patients, but only one used a volumetric method. The aim of the present study was to determine the volume of temporal lobe structures in patients with panic disorder, measured by magnetic resonance imaging. Eleven panic patients and eleven controls matched for age, sex, handedness, socioeconomic status and years of education participated in the study. The mean volume of the left temporal lobe of panic patients was 9% smaller than that of controls (t21 = 2.37, P = 0.028). In addition, there was a trend (P values between 0.05 and 0.10) to smaller volumes of the right temporal lobe (7%, t21 = 1.99, P = 0.06), right amygdala (8%, t21 = 1.83, P =...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Panic disorder; Temporal lobe; Magnetic resonance imaging; Volumetric analysis.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000700014
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Determination of Lateral Ventricle and Brain Volume in Children with Stereological Method Using MRI International Journal of Morphology
Karacan,Keziban; Kosar,Mehmet Ilkay; Çimen,Mehmet; Solak,Orhan; Sahin,Bünyamin.
Although brain development is most active during the intrauterina period of life, the processes of myelination and arborization affect the structure of the brain throughout childhood and adolescence. Brain development is also very active in the early years of a child's life, and continues to be so for approximately 15 years after gestation. Volumetric changes in the brain are effected by sex. Understanding the variability of human brain volume during development is important for the interpretation of childhood neuroimaging studies. Hence the aim of this study is to determine the effects of sex difference on brain volume (BV), lateral ventricle volume (LV) and the ratio of brain volume and lateral ventricle volumes as a percentage (RLBV%) of 90 healthy...
Tipo: Journal article Palavras-chave: Brain; Lateral ventricles; Magnetic resonance imaging; Stereology.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100035
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Extracellular diffusion quantified by magnetic resonance imaging during rat C6 glioma cell progression BJMBR
Song,G.; Luo,T.; Dong,L.; Liu,Q..
Solution reflux and edema hamper the convection-enhanced delivery of the standard treatment for glioma. Therefore, a real-time magnetic resonance imaging (MRI) method was developed to monitor the dosing process, but a quantitative analysis of local diffusion and clearance parameters has not been assessed. The objective of this study was to compare diffusion into the extracellular space (ECS) at different stages of rat C6 gliomas, and analyze the effects of the extracellular matrix (ECM) on the diffusion process. At 10 and 20 days, after successful glioma modeling, gadolinium-diethylenetriamine pentaacetic acid (Gd-DTPA) was introduced into the ECS of rat C6 gliomas. Diffusion parameters and half-life of the reagent were then detected using MRI, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: C6 glioma model; Extracellular space; Magnetic resonance imaging; Rats.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000700610
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Functional changes of human quadriceps muscle injured by eccentric exercise BJMBR
Serrão,F.V.; Foerster,B.; Spada,S.; Morales,M.M.B.; Monteiro-Pedro,V.; Tannús,A.; Salvini,T.F..
The present study evaluated functional changes of quadriceps muscle after injury induced by eccentric exercise. Maximal isometric torque of quadriceps and the surface electromyography (root mean square, RMS, and median frequency, MDF) of the vastus medialis oblique (VMO) and vastus lateralis (VL) muscles were examined before, immediately after and during the first 7 days after injury. Serum creatine kinase (CK) levels and magnetic resonance imaging (MRI) were used to identify muscle injury. The subject was used as her own control and percent refers to pre-injury data. Experiments were carried out with a sedentary 23-year-old female. Injury was induced by 4 bouts of 15 maximal isokinetic eccentric contractions (angular velocity of 5º/s; range of motion from...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Isometric torque; Surface electromyography; Quadriceps muscle; Muscle injury; Eccentric exercise; Magnetic resonance imaging.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000600014
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Gonad volume assessment in the oyster Crassostrea gigas: Comparison between a histological method and a Magnetic Resonance Imaging (MRI) method ArchiMer
Flahauw, Emilie; Quellec, Stephane; Davenel, Armel; Degremont, Lionel; Lapegue, Sylvie; Hatt, Philippe-jacques.
Previous studies comparing Crassostrea gigas selected lines with different susceptibility to summer mortality concluded that the higher the reproductive effort the lower the survival. But theywere lacking individual followup of this reproductive effort which would be of great interest to help us to understand the physiology of the oysters facing summermortalities. Themost frequently usedmethod for assessing the volume of the gonad is to measure the area it occupies on histological sections. Gonad measurement by magnetic resonance imaging, in contrast, is non-destructive and therefore makes it possible to assess individual evolution as well as to compare individuals. The present study compared the values of gonad volume by thismethodwith the values of gonad...
Tipo: Text Palavras-chave: Oyster; Crassostrea gigas; Reproduction; Histology; Magnetic resonance imaging; MRI.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00102/21309/19410.pdf
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Individual monitoring of gonad development in the European flat oyster Ostrea edulis by in vivo magnetic resonance imaging ArchiMer
Davenel, Armel; Gonzalez, Ricardo; Suquet, Marc; Quellec, Stephane; Robert, Rene.
Previous studies have shown that magnetic resonance imaging is a very appropriate non-invasive technique for quantifying the growth of somatic and gonadic tissues and sex determination in the Pacific oyster, Crassostrea gigas. Despite a thinner gonad, harder to distinguish than that of the Pacific oyster, we showed in this study that it was possible to distinguish and quantify the development of the gonad of the European flat oyster, Ostrea edulis, using a 3D MRI sequence with a suitable finer resolution. Compared to T2-weighted images, theoretically the most appropriate for good anatomical description, T1-weighted images were more suited to gonad observation. The gonad development was quantified by the number of voxels with higher grey level. Larvae were...
Tipo: Text Palavras-chave: Oyster; Ostrea edulis; Gonad development; Magnetic resonance imaging.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00014/12508/9363.pdf
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Invasive intracranial aspergillosis spread by the pterygopalatine fossa in an immunocompetent patient BJID
Xiao,Anqi; Jiang,Shu; Liu,Yi; Deng,Kaihong; You,Chao.
Aspergillosis of the central nervous system (CNS) is an uncommon infection, mainly found in immunocompromised patients but rarely seen among immunocompetent patients. Herein we describe a 57 year-old immunocompetent man who suffered intracranial aspergillosis spread by the pterygopalatine fossa (PPF) following a tooth extraction. Based on magnetic resonance imaging (MRI) characteristics, in this report we focus on the spreading routes of CNS aspergillosis via communicative structures of the PPF, the relationship between clinical manifestations and the locations of the lesion, and propose a therapeutic strategy to improve the prognosis.
Tipo: Info:eu-repo/semantics/report Palavras-chave: Aspergillosis; Pterygopalatine fossa; Magnetic resonance imaging.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702012000200016
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Late-life depression, heart failure and frontal white matter hyperintensity: a structural magnetic resonance imaging study BJMBR
Almeida,J.R.C.; Alves,T.C.T.F.; Wajngarten,M.; Rays,J.; Castro,C.C.; Cordeiro,Q.; Telles,R.M.S.; Fraguas,R.J.; Busatto,G.F..
The relevance of the relationship between cardiac disease and depressive symptoms is well established. White matter hyperintensity, a bright signal area in the brain on T2-weighted magnetic resonance imaging scans, has been separately associated with cardiovascular risk factors, cardiac disease and late-life depression. However, no study has directly investigated the association between heart failure, major depressive symptoms and the presence of hyperintensities. Using a visual assessment scale, we have investigated the frequency and severity of white matter hyperintensities identified by magnetic resonance imaging in eight patients with late-life depression and heart failure, ten patients with heart failure without depression, and fourteen healthy...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Major depressive disorder; Old age; Magnetic resonance imaging; Cardiac failure; Cerebrovascular disease; Cardiovascular risk factors.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000300014
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Lissencephaly in a Pekingese OAK
Shimbo, Genya; Tagawa, Michihito; Oohashi, Eiji; Yanagawa, Masashi; Miyahara, Kazuro.
A 1-year-old neutered male Pekingese was presented for evaluation and further treatment of cluster seizures. The dog had behavioral abnormalities, and a prosencephalic lesion was suspected following neurological examination. The dog showed signs of learning difficulty. Magnetic resonance imaging of the brain revealed a remarkably smooth cerebral cortex with a reduced number of gyri, as well as a cystic lesion associated with the quadrigeminal cistern. A diagnosis of lissencephaly, concurrent with a quadrigeminal cisternal cyst, was made. High-dose and multiple anticonvulsants were necessary to control the seizures. This is the first report of lissencephaly in a Pekingese. © 2017 The Japanese Society of Veterinary Science.
Palavras-chave: Lissencephaly; Magnetic resonance imaging; Pekingese.
Ano: 2017 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4564
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Longitudinal brain volumetric changes during one year in non-elderly healthy adults: a voxel-based morphometry study BJMBR
Guimarães,R.M.; Schaufelberger,M.S.; Santos,L.C.; Duran,F.L.S.; Menezes,P.R.; Scazufca,M.; Gouvea,M.T.V; Busatto,G.F..
Previous cross-sectional magnetic resonance imaging (MRI) studies of healthy aging in young adults have indicated the presence of significant inverse correlations between age and gray matter volumes, although not homogeneously across all brain regions. However, such cross-sectional studies have important limitations and there is a scarcity of detailed longitudinal MRI studies with repeated measures obtained in the same individuals in order to investigate regional gray matter changes during short periods of time in non-elderly healthy adults. In the present study, 52 healthy young adults aged 18 to 50 years (27 males and 25 females) were followed with repeated MRI acquisitions over approximately 15 months. Gray matter volumes were compared between the two...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gray matter; Aging; Voxel-based morphometry; Magnetic resonance imaging; Prefrontal cortex; Hippocampus.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012000600007
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Magnetic resonance imaging as a means to assess the body growth and the gonad development of the oyster Crassostrea gigas ArchiMer
Hatt, Philippe-jacques; Davenel, Armel; Eliat, Pierre-antoine; Quellec, Stephane.
To make a preliminary exploration of the possibilities and limits of magnetic resonance imaging (MRI) for assessing body growth and gonad development of the Pacific oyster, Crassostrea gigas, individual monitoring was conducted on diploid and triploid oysters in their second year, maintained from February to October in a pond on the French Atlantic coast. Magnetic resonance imaging was done on each oyster on five dates during the study period. From these images, variations in the volumes of the flesh, digestive gland-gonad and adductor muscle, and the surface of the gills were measured over time. Apart from the well known differences between diploids and triploids related to maturation of gametes, other original observations of assessing growth were made...
Tipo: Text Palavras-chave: Crassostrea gigas; Oyster; Gonad development; Growth; Magnetic resonance imaging; MRI.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6872.pdf
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Meningoencephalitis and new onset of seizures in a patient with normal brain CT and multiple lesions on MRI BJID
Vidal,José E.; Spichler,Anne; Oliveira,Augusto C. P. de; Lomar,André Villela.
Toxoplasmic encephalitis is the most common cerebral mass lesion in patients with AIDS. The definitive diagnosis requires direct demonstration of the tachyzoite form of Toxoplasma gondii in cerebral tissue. The presumptive diagnosis is based on serology, clinical and radiological features, and on response to anti-Toxoplasma therapy. Typically, patients have a subacute presentation of focal neurological signs, with multiple lesions in computed tomography (CT) or magnetic resonance imaging (MRI). However, the neurological and CT scan spectrum is broad. We report a case of toxoplasmic encephalitis in a heterosexual man without prior history of HIV infection. He was admitted with four days of headache, confusion, and new onset of seizures. His brain CT...
Tipo: Info:eu-repo/semantics/report Palavras-chave: Toxoplasmic encephalitis; Computadorized tomography; Magnetic resonance imaging; Acquired immunodeficiency syndrome.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702004000100010
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miR-22 and cerebral microbleeds in brainstem and deep area are associated with depression one month after ischemic stroke BJMBR
Hu,Jia; Zhou,Wei; Zhou,Zhiming; Yang,Qian; Xu,Junfeng; Dong,Wanli.
In this study, we aimed to explore the relationship among miR-22, deep cerebral microbleeds (CMBs), and post-stroke depression (PSD) 1 month after ischemic stroke. We consecutively recruited 257 patients with first-ever and recurrent acute cerebral infarction and performed PSD diagnosis in accordance with the Diagnostic and Statistical Manual IV criteria for depression. Clinical information, assessments of stroke severity, and imaging data were recorded on admission. We further detected plasma miR-22 using quantitative PCR and analyzed the relationship among miR-22, clinical data, and PSD using SPSS 23.0 software. Logistic regression showed that deep (OR=1.845, 95%CI: 1.006-3.386, P=0.047) and brain stem CMBs (OR=2.652, 95%CI: 1.110–6.921, P=0.040), as...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Depression; MicroRNA; Stroke; Cerebral microbleeds; Magnetic resonance imaging.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2020000500611
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Morphometric Analysis of Hemicerebellar Asymmetryn with Central Vertigo Cases: A Stereological Study International Journal of Morphology
Nuket Gocmen-Mas,H; Karabekir,Selim; Yilmaz Kusbeci,Ozge; Sahin,Bunyamin; Ertekin,Tolga; Bas,Orhan; Canan Yazici,A; Senan,Sevda.
We aimed to evaluate the relevant methods of stereology to estimate hemicerebellar asymmetry according to sex in both adult right handed vertigo cases and comparing with healthy cases. The study included 14 adult control subjects and 18 patients with vertigo. The volumes of the cerebellar hemispheres were determined by MRI using the point-counting approach of stereological methods. The mean (±SD) of the right cerebellar hemispheres in the patients with vertigo were 52.49±5.42 cm3 in males, 50.11±4.02 cm3 in females. The mean (±SD) of the left cerebellar hemispheres in the patients with vertigo were 53.11±3.70 cm3 in males, 49.73±4.69 cm3 in females. There was not significant quantitative evidence detected in terms of cerebella asymmetry between sagittal...
Tipo: Journal article Palavras-chave: Cavalier principle; Stereology; Hemicerebellar asymmetry; Magnetic resonance imaging; Vertigo.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200048
Registros recuperados: 25
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