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Applying the Alzheimer Disease ATN Diagnostic Framework in Atypical Dementia.

Cerebrospinal fluid (CSF) biomarkers amyloid-β and tau have been validated for the antemortem diagnosis of Alzheimer disease (AD) and are included in the AT(N) research framework for AD. Recently, an AT(N) CSF profile has been described for dementia with Lewy bodies (DLB), a disorder which is difficult to distinguish clinically from AD, particularly early in the disease course. Herein we describe a 71-year old male who presented with an atypical dementia syndrome including years of stability after an initial abrupt decline, marked visuospatial dysfunction, and relative sparing of memory. CSF biomarkers combined with the pattern of cognitive symptoms made AD unlikely and were consistent with DLB. This classification was confirmed clinically, with the emergence of classic DLB symptoms, and at postmortem pathologic examination. This case highlights the role for AD CSF biomarkers in facilitating earlier diagnosis of non-Alzheimer neurodegenerative dementias.

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