CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
Pulmonary artery blood clot. Light micrograph of a section through a pulmonary artery with an abnormal blood clot (thrombus, pink mass). The thrombus has mostly blocked this major artery that carries blood to the lungs from the heart. The remaining lumen (white) allows some flow of blood. Thrombus formation in a blood vessel can be due to a vascular disorder like atherosclerosis. A blockage of blood flow to the lungs (pulmonary embolism) is swiftly fatal, as all blood has to pass through the lungs for oxygenation. Treatment in this case, involves the anticoagulation drugs heparin and then warfarin to prevent further clots forming. Magnification unknown.
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