ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Pulmonary embolism. Coloured computed tomography (CT) scan of an axial section through the chest of a 75-year-old patient with a pulmonary embolism (PE). An embolism a blockage caused by a blood clot (embolus) that has dislodged and moved to a different area of the body, here to the pulmonary artery in the middle lobe of the left lung. Small clots may cause shortness of breath, dizziness and chest pain. Large clots can be fatal, as the blood is quickly starved of oxygen.
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