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a N-isopropyl-p-iodoamphetamine–single-photon emission computed tomography three-dimensional stereotactic surface projection showing a decrease in cerebral blood flow on the date of diagnosis (at the age of 75 years). The white arrows indicate the posterior cingulate gyrus and precuneus, where blood flow is reduced in Alzheimer's disease. b Follow-up data (at the age of 80 years). The blood flow of white arrows is decreased
