Caption

Alzheimer's disease. Coloured magnetic resonance imaging (MRI) scan of an axial (horizontal) section through the brain of a 68-year-old patient suffering from Alzheimer's disease. In this condition there is widespread destruction of brain tissue, leading to abnormally deep folding and shrinkage of the brain (green/orange). The brain's fluid-filled ventricles (two seen, black, centre) may become enlarged. The disease leads to memory loss and disorientation, and is the most common cause of senile dementia. Alzheimer's disease has no known cause and there is no cure.