SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Stroke. Coloured three-dimensional magnetic resonance imaging (MRI) scan of the brain of a 65 year old after a cerebrovascular accident (CVA, or stroke). An infarct (area of dead tissue, orange) is seen in the sylvian fissure of the left hemisphere, which is associated with language. The infarct is a result of haemorrhage, caused by hypertension (high blood pressure), which lead to loss of blood flow to that area of the brain. In this case the infarct caused aphasia, the loss of ability to articulate ideas or comprehend written or spoken language.
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