See also: List of states and territories of the United States. This table includes abbreviations for three independent nations related to the United States through Compacts of Free Association, and other comparable postal abbreviations, including those now obsolete. Codes and abbreviations for U.S. states, territories and other regions.
Pulmonary embolism is the sudden blockage of a major blood vessel (artery) in the lung, usually by a blood clot . In most cases, the clots are small and are not deadly, but they can damage the lung. But if the clot is large and stops blood flow to the lung, it can be deadly.
In rare cases, an air bubble or part of a tumor or other tissue travels to the lungs and causes a blood clot in the lungs. A blood clot in the lungs is a pulmonary embolism. If a large bone in the body (like the thigh bone) breaks, fat from the bone marrow can travel through blood and reach the lungs.