PR. R. ABELANET - CNRI / SCIENCE PHOTO LIBRARY PR. R. ABELANET - CNRI / SCIENCE PHOTO LIBRARY
Brain aneurysm. Close-up of a brain affected by a fusiform aneurysm of the trunk of the basilar artery - one of the arteries that supplies the brain with blood. An aneurysm occurs when an artery wall weakens and swells like a balloon. If it bursts, an aneurysm can cause severe internal haemorrhage (bleeding) and, if left untreated, death.
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