Stroke. Coloured gamma camera scans of axial (top) and sagittal (bottom) sections through a head showing a stroke. This has been caused by a brain haemorrhage. The red areas in the rectangles show dead or dying brain tissue. Normal brain tissue is green. The area was damaged as it was deprived of oxygenated blood when a blood vessel in the brain burst. Symptoms of a stroke (cerebrovascular accident) vary depending on which part of the brain is affected. Death or partial paralysis often result, although some may cause no more than a headache. Strokes are a leading cause of death, and are usually due to high blood pressure.
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