An aneurysm that occurs in the chest portion of the aorta is called a thoracic aortic aneurysm (TAA).
TAAs don’t always cause symptoms, even when they’re large. Only half of all people who have TAAs notice any symptoms. TAAs are found more often now than in the past because of chest CT scans done for other medical problems.
With a common type of TAA, the walls of the aorta weaken and a section close to the heart enlarges. As a result, the valve between the heart and the aorta can’t close properly. This allows blood to leak back into the heart.
A less common type of TAA can develop in the upper back, away from the heart. A TAA in this location may result from an injury to the chest, such as from a car crash.
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