BSIP VEM / SCIENCE PHOTO LIBRARY BSIP VEM / SCIENCE PHOTO LIBRARY
Pulmonary embolism. Coloured angiogram of lungs affected by pulmonary embolism. This image shows arteries (red) supplying the lungs. The lung at left is normal. The lung at right shows infarction (black) - death of an area of tissue that has been deprived of blood. In this case the infarction is caused by an embolus (a fragment of a blood clot) that has lodged in the lung and blocked an artery. The affected area is dark because it has filled with leaking blood. Pulmonary angiograms are X- rays made after injecting a radio-opaque dye into the pulmonary artery via a catheter passed through the heart. Pulmonary embolism is a common cause of sudden death in the elderly.
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