GRN and Behcet disease: A systematic literature analysis reveals that psychosis is a frequent symptom in FTD in the presence of genetic mutations in GRN and C9ORF72 genes (Shinagawa et al., 2014); in C9ORF72 carriers, psychotic symptoms can even predominate at onset and lead to a diagnosis of OBC, SCZ or BD (Rohrer et al., 2015).