ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Stroke brain damage. Coloured axial computed tomography (CT) scan through the brain of a 70-year-old man with damage (dark area at upper right) caused by a stroke (cerebrovascular accident, CVA). This area of damage is in the brain's left hemisphere, and affects the right-hand side of the body. A stroke is where the brain is damaged due to hypoxia (lack of oxygen). This is usually due to an interruption or other damage to the blood supply, such as a burst blood vessel or a clot blocking the blood flow to the brain.
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