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Cerebral infarction after stroke. Coloured scintigram of a horizontal slice through a brain affected by infarction (blue, upper & lower right) due to stroke. Red and white show areas of high radioactivity (normal tissue); blue shows areas of low activity. Infarction is the death of tissue due to interruption of its blood supply. The usual cause of infarction in the brain is blockage of an artery by a clot or an embolism (a solid fragment carried in the blood), or rupture of one of the brain's arteries. The resulting nervous disturbance is called a stroke or cerebrovascular accident. The radioactive tracer used to highlight this patient's brain was technetium (99mTc).
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