PR. R. ABELANET - CNRI / SCIENCE PHOTO LIBRARY PR. R. ABELANET - CNRI / SCIENCE PHOTO LIBRARY
Aortic aneurism. Section through an aneurism in the thoracic aorta. 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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