Aneurysm: A localized widening (dilatation) of an artery, a vein, or the heart. At the point of an aneurysm, there is typically a bulge. The wall of the blood vessel or organ is weakened and may rupture. SLIDESHOW Heart Disease: Symptoms, Signs, and Causes See Slideshow From Healthy Heart Resources Psoriasis and Heart HealthCrohn's Disease and Your HeartCommon Health Conditions Among Minorities Featured Centers Good and Bad Foods for PsoriasisVideo: Getting Personal on Life With MS Health Solutions From Our Sponsors Shot-Free MS Treatment Your Child and COVID-19