Ischaemic stroke, CT scan
3D computed tomography (CT) scan of the bran of a patient who has had an ischaemic stroke or cerebrovascular accident (CVA) affecting the supplementary motor area (left). An ischaemic stroke is caused by a blockage or interruption of the blood supply to the brain. The lack of oxygen (hypoxia) damages the brain. Symptoms depend on the area affected., by VSEVOLOD ZVIRYK/SCIENCE PHOTO LIBRARY
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