C9orf72 and corticobasal degeneration disorder: C9orf72 intermediate expansions of 24–30 repeats have recently been found associated with ALS in a large meta-analysis on 5071 cases and 3747 controls [59], but characteristic nuclear RNA foci and DPR aggregates were absent in one ALS patient with an intermediate expansion of 16 repeats [60] and 9 cases with corticobasal degeneration and intermediate repeats ranging from 17 to 29 units [10].