ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Brain aneurysm. Coloured digital subtraction angiogram (DSA) of the head of a 38-year-old, showing a large aneurysm (bright, centre) of the right internal carotid artery. An aneurysm is the ballooning of an artery due to weakening of the artery wall.
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