Coloured 3D computed tomography (CT) scan showing an aneurysm (swelling, Upper centre) in the aortic arch. 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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Photo credit: © VSEVOLOD ZVIRYK/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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