LUNAGRAFIX / SCIENCE PHOTO LIBRARY LUNAGRAFIX / SCIENCE PHOTO LIBRARY
Brain after stroke. Coloured computed tomography (CT) scan of a brain affected by a cerebrovascular accident (CVA), or stroke. The scan shows a horizontal slice through the head, with the eyes (yellow) at upper centre. Tissue damaged by the stroke is at lower left (yellow). A stroke occurs when a blood vessel in the brain ruptures or is blocked, disrupting blood flow and cutting off the supply of oxygen and nutrients to the tissue. Damage from a stroke can cause a variety of symptoms, including weakness or paralysis in parts of the body, and speech impairment. Extensive damage to the brain can lead to death.
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