VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY
Stroke. Conceptual image of a flash of light in a human head, representing a stroke or cerebrovascular accident (CVA). 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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