Pulmonary Thromboendarterectomy for Chronic Pulmonary Embolism
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http://www.ctsnet.org/doc/5595 
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Description
A pulmonary embolism occurs when a blood clot lodges in the blood vessels of the lung (pulmonary arteries). The clot is called an embolus, and it most often begins as a clot in the veins of the legs. This is information on the removal of chronic pulmonary embolisms.