Interestingly, an unexpected link between FTD and cerebellar atrophy has recently been discovered (Bocchetta et al., 2016; Bussy et al., 2023; Chen Y. et al., 2019); more research is needed to understand the contribution of different MAPT mutations or sporadic tau pathologies to cerebellar atrophy. The gene discussed is MAPT; the disease is frontotemporal dementia.