Frontotemporal dementia is a broad term for a group of uncommon brain disorders that affect the frontal and temporal lobes of the brain. These are the parts of the brain associated with personality, language and behaviour. In frontotemporal dementia, the brain cells in the frontal or temporal lobe atrophy (shrink) and die, disrupting neural networks and causing changes in behaviour. Frontotemporal dementia is often misdiagnosed as psychosis or Alzheimer’s disease. Frontotemporal dementia often occurs between the ages of 45 and 60 years.