C9orf72 and frontotemporal dementia: The C9orf72 negative ALS‐FTD cohort not only exhibits widespread WM pathology in core ALS‐associated regions such as the corticospinal tracts and corpus callosum, but in line with more recent studies, in the cerebellar peduncles, long association fibers, arcuate fasciculus, uncinate and cingulum (Bede, Chipika, et al., 2021; McKenna, Chipika, et al., 2021; Trojsi, Di Nardo, Caiazzo, et al., 2020) (Table 2).