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Aneurysm description

An aneurysm is a fluid-filled pouch that forms as a result of a separation in the wall of a blood vessel. It usually occurs in a weak area of an artery’s wall where the blood pressure forces the weakened area to bulge outward.

An aneurysm can rupture resulting in internal bleeding. A large rupture may be rapidly fatal. A small one, sometimes termed a leak, may produce warning symptoms that allow people to seek medical care.


Review Date: 5/10/2024
Reviewed By: Luc Jasmin, MD, Ph.D., FRCS (C), FACS, Department of Neuroscience, Guam Regional Medical City, Guam; Department of Surgery, Johnson City Medical Center, TN; Department of Maxillofacial Surgery at UCSF, San Francisco, CA. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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