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We report a 63 year-old woman who developed central pontine and extrapontine
myelinolysis after rapid correction of hyponatremia. Lesions on brain MRI showed
hypermetabolism on 18FDG-PET scan in the early stage of the disease and became
hypometabolic on the follow-up scan. We suggest that active microglia and
astrocytes are the main cause of the increased glucose metabolism.