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• W2000104714 abstract "We report 2 patients of mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) and consider the pathophysiology of stroke-like lesions, using magnetic resonance imaging (MRI), diffusion-weighted imaging (DWI) on MRI, perfusion imaging on MRI, and 1H magnetic resonance spectroscopy (1H-MRS). In Patient 1, T2-weighted imaging (T2-WI) on MRI at onset and even at 44 days after onset of the stroke-like episode showed high intensity in left parietal, temporal, and occipital lobe lesions. In the temporal lobe lesion, the apparent diffusion coefficient (ADC) at 44 days after onset was higher (average: 1.219 × 10−3 mm2/s) than that in a normal region (average: 0.796 × 10−3 mm2/s). 1H-MRS of the left parietal lobe lesion at the same day showed a decrease in N-acetylaspartate/(creatine + phosphocreatine) (NAA/Cr) (0.43) and a peak in lactate. 1H-MRS of the contralateral side at the same day showed NAA/Cr (1.57) and no peak in lactate. Thereafter, ADC gradually decreased and NAA/Cr gradually increased, and the peak in lactate disappeared in the lesion. In Patient 2, T2-WI at onset showed high intensity in bilateral occipital lobe lesions. In the left occipital lobe lesion, ADC at the same day was higher (1.082 × 10−3 mm2/s) than that in a normal region (average: 0.841 × 10−3 mm2/s). 1H-MRS of the left occipital lobe lesion at the same day showed a decrease of NAA (3.0 mM) and a peak in lactate (13.1 mM) (measured by LCModel). In 1H-MRS of the normal left parietooccipital lobe at 4 months before onset, NAA was 7.6 mM and there was no peak in lactate (0 mM). Perfusion imaging at onset showed high intensity in bilateral occipital lobes, which indicated hyperperfusion in stroke-like lesions. Thereafter, ADC gradually decreased and the peak in lactate partially decreased, and the low concentration of NAA persisted (regardless of the partial recovery) in the lesion. These results suggest that the stroke-like episodes is related to vasogenic edema, hyperperfusion, and neuronal damage. Acute oxidative phosphorylation defect may have a crucial role in the pathophysiology of stroke-like episodes." @default.
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• W2000104714 date "2008-08-01" @default.
• W2000104714 modified "2023-09-26" @default.
• W2000104714 title "Serial brain imaging analysis of stroke-like episodes in MELAS" @default.
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• W2000104714 doi "https://doi.org/10.1016/j.braindev.2008.01.003" @default.
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