Primary progressive aphasia (PPA) may develop in people with Alzheimer’s disease. Aphasia is an impairment of speech and language comprehension which also affects the ability to read and write.

Furthermore, most patients with progressive nonfluent aphasia, a subtype of FTLD, show PSP or CBD post-mortem. Even tau-related cases of FTLD, CBD and PSP are distinguishable on the basis of other ...