http://www.nhlbi.nih.gov/health/dci/Diseases/arm/arm_what.html
National Heart, Lung, and Blood Institute, National Institutes of Health
This publication discusses aneurysm (AN-u-rism), which is an abnormal bulge or “ballooning” in the wall of an artery. The page links to additional information about aneurysm, including types, causes, signs and symptoms, diagnosis, treatments, and prevention.