ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Cerebral aneurysm. Coloured 3D computed tomography (CT) angiograms of a cerebral aneurysm (swelling) in an artery in the brain of a 28-year-old woman. These scans are in tissue mode (left) and transparency mode (right). The aneurysm is at centre left and far right. An aneurysm occurs when an artery wall weakens and swells. If it bursts, an aneurysm can cause severe internal bleeding. This image was 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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