ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Aneurysm in head. Coloured X-ray showing an aneurysm (swelling, black, upper right) at the junction between several arteries (red) at the base of the brain. An aneurysm occurs when a weak artery wall stretches and fills with blood. Most aneurysms do not causes symptoms, but if left untreated they may rupture, causing severe internal bleeding. Surgical excision of the affected area and the use of an artificial graft to repair the artery wall is usually required. This aneurysm has occurred where the internal carotid artery (lower frame), which supplies blood to parts of the brain and face, branches into the cerebral arteries (upper right).
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