ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Cerebral aneurysm. Coloured angiogram (blood vessel X-ray) of the brain and neck of a 28-year-old woman with a cerebral aneurysm (centre left) in a brain artery. An aneurysm occurs when an artery wall weakens and swells. The aneurysm is also shown as imaged by a coloured 3D computed tomography (CT) angiogram (orange). If it bursts, an aneurysm can cause severe internal bleeding. These images were obtained during interventional angiography to treat the aneurysm. The aneurysm is in a carotid artery at the level of the brain's anterior communicating artery.
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