JIM DOWDALLS / SCIENCE PHOTO LIBRARY JIM DOWDALLS / SCIENCE PHOTO LIBRARY
This illustration depicts the brain condition AVM, or Arteriovenous Malformation. AVMs are masses of abnormal blood vessels which can grow in the brain. They consist of a blood vessel ''nest'' through which arteries connect directly to veins, instead of through capillaries, as is the norm. This massing of vessels can cause pressure build-up within the vessels, and can lead to hemorrhagic bleeding in the brain, which may in turn cause stroke or brain damage.
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