DR M O HABERT, PITIE-SALPETRIERE, ISM / SCIENCE PHOTO LIBRARY DR M O HABERT, PITIE-SALPETRIERE, ISM / SCIENCE PHOTO LIBRARY
Stroke. Coloured single photon emission computed tomography (SPECT) scans and magnetic resonance image (MRI) scans of axial (left), vertical (centre) and side (right) sections through the brain of a patient that has had a stroke. The crosses are centred on the infarct (area of dead tissue) in the thalamus, the area of the brain that relays sensory impulses to the cerebral cortex. A complication of the infarct is a decrease in blood flow (blue and green on SPECT scans) to the cerebral cortex (front of brain). The dead tissue was caused by an obstruction in an artery that resulted in an interruption to blood flow. The obstruction may have been a thrombosis (blood clot) or embolism (air bubble or particle).
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