Journal of neuroimaging : official journal of the American Society of Neuroimaging
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Multicenter Study Clinical Trial
Noninvasive fractional flow on MRA predicts stroke risk of intracranial stenosis.
Fractional flow may identify hemodynamic effects and ischemic risk beyond percent stenosis of an artery. We hypothesized that diminished TOF-MRA signal intensity distal to an intracranial stenosis predicts stroke risk. ⋯ This trial was not registered because enrollment began prior to July 1, 2005.
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Comparative Study Controlled Clinical Trial
Brain atrophy in radiologically isolated syndromes.
The aim of this study was to compare brain atrophy in radiologically isolated syndrome (RIS), in clinically isolated syndrome (CIS), and in individuals with subjective complaints (ISC). ⋯ NTBV and NCV were significantly lower in RIS compared with ISC while no differences were observed in NWMV.
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To investigate the impact of regression methods on resting-state functional magnetic resonance imaging (rsfMRI). During rsfMRI preprocessing, regression analysis is considered effective for reducing the interference of physiological noise on the signal time course. However, it is unclear whether the regression method benefits rsfMRI analysis. ⋯ rsfMRI data processed using regression should be interpreted carefully. The significance of the anticorrelated brain areas produced by global signal removal is unclear.
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The typical form of mild encephalitis/encephalopathy with a reversible splenial lesion— called MERS type I—is characterized by a singular, reversible lesion in the midline of the splenium. Very rarely, additional lesions with similar signal characteristics can occur in other brain areas, which is then referred to as MERS type II. We present the case of a patient with a reversible splenial lesion and concomitant reversible cerebellar lesions within the scope of an atypical hemolytic uremic syndrome (HUS).
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Controlled Clinical Trial
No signs of intracranial arterial vasoconstriction in transient global amnesia.
The current theories to explain the pathophysiology of transient global amnesia (TGA) involve epilepsy, migraine, and hippocampal ischemia which might be determined by venous congestion or arterial vasoconstriction triggered by Valsalva-associated maneuvers in susceptible individuals. ⋯ Extra-intracranial atherosclerosis does not play a pathogenic role in TGA and no supporting evidence for the arterial vasoconstriction hypothesis of TGA emerged from this study.