ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Stroke. Coloured computed tomography (CT) scan of a section through the brain of a patient 90 days after a haemorrhagic stroke, showing a lesion (black, centre left). A stroke, or cerebrovascular accident (CVA), is the rapid loss of brain function due to a disturbance in the blood supply to the brain. Here, arterial hypertension (high blood pressure) caused a blood vessel to burst, leaking blood (haemorrhaging).
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