ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Cerebral aneurysm. Angiogram (blood vessel X-ray) of the brain of a 28-year-old man with a cerebral aneurysm (lower left) in a brain artery. An aneurysm occurs when an artery wall weakens and swells. If it bursts, an aneurysm can cause severe internal bleeding. This large aneurysm is affecting the carotid arteries at the level of the brain's right middle cerebral artery.
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