Stroke, CT brain scan

Stroke, CT brain scan

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Credit: ZEPHYR/SCIENCE PHOTO LIBRARY

Caption: Stroke. Coloured computed tomography (CT) scans of an axial section through the head of a 62-year-old patient with a stroke. The front of the brain is at top and the right hemisphere is seen at left. A large infarct (dead tissue, dark patch at right) is seen in the sylvian fissure of the left hemisphere. The infarct is a result of ischaemia, a lack of blood flow caused by a blood vessel obstruction. The blockage may be due to a thrombus (blood clot) or embolism (air bubble or loose blood clot). Strokes can be instantly fatal, or may pass unnoticed. Symptoms can include muscle weakness, behavioural changes or paralysis.

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