Scatter plots demonstrating caudate (A), frontal grey matter (B), total grey matter (C), caudate/total grey matter (D), frontal grey matter/total grey matter (E), and caudate/frontal grey matter (F) volumes in FTLD-FUS cases compared to FTLD-TDP and FTLD-TAU cases. There was no overlap in caudate, caudate/total grey matter and caudate/frontal grey matter volumes between FTLD-FUS and the other groups, with smaller volumes observed in FTLD-FUS. The mean value for each group is shown using a red line.