Amyloid PETs are commonly negative in suspected Alzheimer’s disease with an increase in CSF phosphorylated-tau protein concentration but an Aβ42 concentration in the very high range: a prospective study
2019
Background
Atypical cerebrospinal fluid (CSF) patterns, involving an increase in the concentration of phosphorylated-tau (P-tau) proteins but normal amyloid-β concentration, are not uncommon in patients with mild neurocognitive disorders and suspected Alzheimer’s disease (AD). In these conditions, however, AD diagnosis may be ruled out in the absence of any amyloid deposition at positron-emission tomography (PET). This pilot cross-sectional study was aimed to determine whether this negativity of amyloid PET can be predicted by CSF profiles in such patients.
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