Pattern of grey matter involvement in C9orf72 for the stages defined by CDR®+NACC FTLD global scores. The color map indicates the percentile corresponding to the mean w-scores in each group (C9orf72 ≤ 0.5/≥1: n = 113/47), when these were statistically abnormal (i.e. significantly different from 0, t-test) when compared to controls (n = 240).