MAPT and primary progressive aphasia: Highest mean densities (inclusions per mm3) of DG tau pathology were found in PPA-PiD cases (M = 77,105; SD = 30,642), followed by PPA-CBD (M = 15,611; SD = 15,654), PPA-AD (M = 5,674; SD = 3,549), and lastly PPA-PSP (M = 1,119; SD = 3,549).