Frontotemporal dementia
Frontotemporal dementia (FTD), also known as frontotemporal degeneration, and historically as Pick's disease, is a family of neurodegenerative disorders, caused by frontotemporal lobar degeneration that affects the frontal and temporal lobes. The FTD family includes behavioral variant FTD (bvFTD), primary progressive aphasia (PPA) and its semantic and nonfluent/agrammatic variants (svPPA and nfvPPA), primary progressive apraxia of speech (PPAOS), progressive supranuclear palsy (PSP), and corticobasal syndrome (CBS).