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Aortic aneurysm, CT angiogram
3D CT angiogram (left) and 2D CT angiogram (right) of a 64-year-old patient showing the presence of a large spindle-shaped aneurysm of the ascending thoracic aorta, measuring 53 mm. 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., Creditline:ZEPHYR/SCIENCE PHOTO LIBRARY
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