MAPT and Alzheimer disease: At the time of flortaucipir PET scans, there were no age differences between the ADNC group (73.8 +/- 3.6 y.o.)and the non-AD group (75.5 +/- 8.3 y.o.), (P>0.88; Table 1). Of the three patients with PSP pathology, one with PSP-RS showed typical PSP pathology while the other two with PSP-SL showed atypical PSP pathology with more cortical 4R tau deposition.