Fig. 1

Prevalence of typical and atypical clinical phenotypes of AD in a clinical sample^a

^aThe clinical sample comprised 523 patients who were consecutively referred to a specialist dementia clinic and diagnosed with AD; 42 patients had MCI and are not included in the pie chart [12]. Patients with language presentation most likely had lvPPA, though it is possible patients may have had nfPPA. AD, Alzheimer’s disease; CBS, corticobasal syndrome; lvPPA, logopenic variant of primary progressive aphasia; MCI, mild cognitive impairment; nfPPA, non-fluent primary progressive aphasia; PCA, posterior cortical atrophy; svPPA, semantic variant primary progressive aphasia