ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Carotid aneurysm. Magnetic resonance imaging (MRI) scan of a section through the head and neck of a 22-year-old patient with a large aneurysm (round, centre-left) affecting the right internal carotid artery at the level of the carotid bifurcation. An aneurysm occurs when an artery wall weakens and swells like a balloon. If it bursts, an aneurysm can cause severe internal haemorrhage.
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