Aneurysm in the brain. Angiography blood vessel X_ray footage that shows an aneurysm round, lower centre of the blood vessels black in the brain of a young patient. This aneurysm an abnormal swelling of the blood vessel is near the termination of the right internal carotid artery, a major artery of the head and neck that supplies blood to the brain. This artery is being scanned to locate the cause of a subarachnoid haemorrhage, internal bleeding around the brain that can be caused by injuries or ruptures of aneurysms in this and related arteries. The blood vessels are visible on this X_ray footage because they have been injected with a radio_opaque contrast medium.