TARDBP and frontotemporal dementia: Some patients who were retrospectively included in this study could have been currently categorized as being affected by a right temporal variant of FTD (rtvFTD) whose presentation also includes subtle language deficits [116], but the underlying pathology of rtvFTD is believed to predominantly involve TDP-43, with a reported frequency as high as 90%, similar to that observed in svPPA [117, 118].