FDG-PET is a valuable imaging technique as part of a diagnostic protocol in the general patient population with FUO and a raised ESR or CRP.

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According to current dementia guidelines from 2005 (CBO) functional brain imaging by PET-scan of the brain has no place in the analysis of a dementia syndrome. Differential diagnosis between Alzheimer disease and other causes of dementia remains important because there are differences in natural course and treatment. Here we present three patients aged 62, 71 and 68 years with dementia syndrome who were assessed at an outpatient memory clinic. After geriatric assessment and subsequent brain MRI the etiology of the dementia remained unclear. In all three patients the etiology became clear after using a 18 FDG PET-scan of the brain. We conclude that 18 FDG PET imaging of the brain has added value in the analysis of dementia syndrome with an unclear etiology after initial analysis.