TARDBP and Mental deterioration: Among the three TDP-43 positive RP-CBD cases, two cases had mild TDP-43 pathology in the hippocampus and amygdala (RP-5, RP-6) and one case had mild TDP-43 pathology in the pontine tegmentum (RP-3), who presented with rapid global cognitive decline without any record of having a downgaze palsy.