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Alzheimer disease

Alzheimer disease is the most common cause of dementia - a slow decline in mental ability. It affects one in twenty people over 65, and more than one in ten of those over 85. Alzheimer disease is caused by the gradual death of certain brain cells, especially in the areas involved in memory. The memory loss in Alzheimer disease can eventually be devastating: patients often don't recognise their families, and forget where they live or how to take care of themselves.

PET scan of an Alzheimer disease brain (right) and normal brain (left).
PET scan of an Alzheimer disease brain (right) and normal brain (left).
Photodisc

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