SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Stroke, coloured computed tomography (CT) scan. A stroke is death of brain tissue caused by lack of blood flow. In this case, a ruptured blood vessel has led to an area of bleeding (red) around the Sylvian fissure of the left hemisphere of the brain. The scan is from below, so the left hemisphere appears on the right side of the scan. Strokes can be caused by a head injury, high blood pressure or an embolism. The symptoms depend on the region of the brain affected. The Sylvian fissure in the left hemisphere is associated with language and speech, so such a stroke is likely to cause speech disturbances. Treatment may involve removal of clotted blood, and drugs to reduce blood pressure or to thin the blood.
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