Cerebral aneurysm. 3D computed tomography (CT) scan and angiogram of the skull and brain of a 47-year-old man, showing an aneurysm (swelling) in an ar

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Cerebral aneurysm. 3D computed tomography (CT) scan and angiogram of the skull and brain of a 47-year-old man, showing an aneurysm (swelling) in an artery in the brain. The large aneurysm is in the upper part of the right internal carotid artery. 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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