having the C9ORF72 gene mutation by 15-fold. Thus, it is possible that mutation in the C9ORF72 gene may be a major cause not only of FTD and MND (Dejesus- Hernandez a al., 2011; Renton et at, 2011), but also of late onset psychosis (Ferrari et al., 2012; Murray et al., 2011). Of note, aside from FTD-M