Aortic aneurysm in hypertension. Coloured 3D computed tomography (CT) scan of the chest of a 53-year-old patient with arterial hypertension (high blood pressure), showing an aneurysm of the aortic arch (upper centre). The heart can be seen at lower right. 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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