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Pulmonary embolism. X-ray of the chest of a 72 year old male patient with a pulmonary embolism. This is a blockage of the pulmonary artery, which carries deoxygenated blood from the heart to the lungs. The blockage is caused by a blood clot that has travelled from elsewhere in the body, usually from a deep vein thrombosis. The tube seen here is an endoscope.
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