Berry aneurysm: A small aneurysm that looks like a berry and classically occurs at the point at which a cerebral artery departs from the circular artery (the circle of Willis) at the base of the brain. Berry aneurysms frequently rupture and bleed. SLIDESHOW Brain Food Pictures: What to Eat to Boost Focus See Slideshow From Brain and Nervous System Resources Relieve Spasticity IssuesAdvice for Living With Myasthenia GravisUnpredictable Days With Myasthenia Gravis Featured Centers What Are the Best PsA Treatments for You?Understanding Biologics 10 Things People With Depression Wish You Knew Health Solutions From Our Sponsors Shot-Free MS Treatment Your Child and COVID-19