K H FUNG / SCIENCE PHOTO LIBRARY K H FUNG / SCIENCE PHOTO LIBRARY
Thoracic aortic aneurysm. Coloured rotating 3D computed tomography (CT) scan showing the heart, aorta and pulmonary vessels in the chest. At right is a large aneurysm that has formed in the descending thoracic aorta. The aorta is the main body artery. An aneurysm is a swelling of the the artery wall, and can be fatal if it ruptures.
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