Fronto-temporal dementia or frontotemporal lobar degeneration refers to a group of disorders caused by progressive cell loss in the brain's frontal lobes or its temporal lobes. These areas of the brain play a significant role in decision-making, behavioral control, emotion, and language. FTD can be inherited, with genetic forms making up to 20% of all FTD cases. Mutations in the progranulin gene are a common genetic cause of FTD.