CHRIS BJORNBERG / SCIENCE PHOTO LIBRARY CHRIS BJORNBERG / SCIENCE PHOTO LIBRARY
Surreal face with superimposed brain, illustrating a cerebral aneurysm or widening of a cerebral artery. Aneurysms occur in weakened areas in the wall of a blood vessel and may occur as a congenital defect or develop later in life. Aneurysms do not usually cause any symptoms unless they rupture and bleed. A bleeding aneurysm can cause sudden headache, headache with nausea or vomitting, muscle weakness, numbness, vision changes, eyelid drooping, changes in mental status, seizures, and speech impairment.
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