ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Alzheimer's disease. Coloured axial magnetic resonance imaging (MRI) scan of a section through the brain of a 65 year old patient showing atrophy (wasting) due to Alzheimer's disease. The brain (orange) is seen to be reduced in size by large dark lines, which result from the deepening and widening of the natural furrows (sulci) on the brain's surface. Alzheimer's disease causes dementia, symptoms of which include memory loss, particularly of recent events, disorientation, anxiety and personality changes. In severe cases, hallucinations and delusions may occur. There is no treatment for the disease, and mental functions usually decline until death.
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