Fig. 1.

The ranges of syndromal staging of the cognitive continuum (SSC), the National Institute on Aging (NIA) at National Institutes of Health and the Alzheimer's Association published revised guidelines (NIA-AA) for modernization of the diagnosis of Alz­heimer's disease, and NIA-AA + (D) are plotted as a radial chart. NIA-AA standard schematically represents SSC. SSC has the smallest range compared to the NIA-AA and NIA-AA + (D). NIA-AA + (D) monitors a wider range than the NIA-AA. The management scope for Alzheimer's disease will be further expanded if the NIA-AA standard includes (D).