TREM2 and frontotemporal dementia: The most common genotypes included in FTD thalamus studies are C9orf72 (93%; n = 42/45), followed by GRN (38%; n = 17/45) and MAPT (33%; n = 15/45) mutation carriers as well as less common genotypes such as TARDBP, SOD1, FUS, TBK2, or TREM2 (4%; 2/45).