C9orf72 and frontotemporal dementia: It is reported that FTD due to C9orf72 repeat expansions may have slower disease progression, more diffuse brain atrophy that tends to also affect the parietal regions bilaterally, and a higher frequency of psychiatric features compared to sporadic cases (Galimberti et al., 2013; Devenney et al., 2014; Ducharme et al., 2017).