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Figure 12c. FDG PET images demonstrate typical findings in (a-c) three patients with AD and (d) one patient with frontotemporal dementia. (a) Note bilateral parieto-occipital hypometabolism (arrows) in a 77-year-old woman with AD. (b) Bilateral parietal hypometabolism (arrows) is also noted in a 62-year-old woman with AD. (c) Changes may be asymmetric, as demonstrated in a 53-year-old woman with AD, with the metabolic defect (arrow) primarily on the left. (d) As shown in a patient with frontotemporal dementia, PET may help differentiate frontotemporal dementia from AD by demonstrating metabolic deficits (arrows) in the frontal and anterior temporal lobes (not shown).