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| | Pulmonary Embolism -- Topic Overview |
 | | Pulmonary embolism is the sudden blockage of an artery in the lung. |
 | | The most common cause of pulmonary embolism is a blood clot that forms in a deep vein in your leg, breaks loose, travels to the lungs, and becomes trapped in one of the smaller lung arteries. |
 | | Other substances, such as tumors, air bubbles, amniotic fluid, or fat that is released into the blood vessels, may also block an artery, but such causes are rare. |
| www.webmd.com /hw/lung_disease/ue4085.asp (161 words) |
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