SNCA and dementia: Accordingly, the National Institute on Aging‐Alzheimer's Association (NIA‐AA) guidelines for neuropathological assessment propose that in cognitively impaired individuals with higher Aβ levels and lower Braak stages, the relative contribution of vascular and alpha‐synuclein co‐pathologies should be considered, highlighting the importance of examining these co‐pathologies in Aβ‐positive individuals with dementia with lower levels of tau‐PET binding.19