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In addition, brain perfusion can be studied with arterial spin labeling (ASL), which is a non-invasive MRI perfusion method that quantitatively measures cerebral blood flow per unit tissue mass. We followed up a 47-year-old patient with mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) by continuous arterial spin labeling technique, which showed crossed cerebellar hyperperfusion after acute stroke-like episode. 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