ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Aortic aneurysm. Coloured computed tomography (CT) angiogram of a section through the chest of a 43-year-old patient, with an aneurysm (arrows) in the right aortic arch. The lungs (left and right), trachea (dark, vertical, centre) and bronchi (dark, centre left and right) can also be seen. An aneurysm is a blood-filled dilation in a blood vessel wall. It is caused by a weakening of the vessel wall, which may be caused by hardening of the vessel (atherosclerosis), high blood pressure or injury. If left untreated an aneurysm can rupture, which is often fatal.
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