JIM DOWDALLS / SCIENCE PHOTO LIBRARY JIM DOWDALLS / SCIENCE PHOTO LIBRARY
This illustration depicts a type of therapy that fills a brain aneurysm with a special type of polymer liquid that hardens into a cast soon after introduction. This hardened cast fills the aneurysm which previously was filled with blood. An aneurysm is a balloon-shaped defect in a weak spot on a blood vessel wall, which impedes the natural flow of blood through that vessel. An aneurysm in the brain can lead to hemorrhagic stroke.
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