MAPT and frontotemporal dementia: Among patients with bvFTD due to FTLD-tau, around 70% have Pick's disease, 20% havecorticobasal degeneration (CBD) and most of the remainder have progressivesupranuclear palsy (PSP) at neuropathological examination.15,36 Aspreviously mentioned, FTLDtau is the most common neuropathological finding inPNFA.37 Among PNFA casesdue to FTLD-tau, around 40% are diagnosed with PiD, 30% with PSP and 30% with CBD.SD is due to a tauopathy in only 20% of cases, most of which are classified as PiDor AGD.15,37