Give now

In My Area

Support groups
  • Baltimore Brain Aneurysm Foundation Support Group

    Lutherville-Timonium, MD

    Learn more
  • Bay Area Aneurysm and Vascular Malformation Support Group

    San Francisco, CA

    Learn more
  • Beth Israel Deaconess Brain Aneurysm Support Group

    Boston, MA

    Learn more

Brain Aneurysm Basics

What is a brain aneurysm?

A brain aneurysm is a weak, bulging area in an artery in the brain, analogous to a thin balloon or a weak spot on a tire’s inner tube. Because its walls may be weak and thin, an aneurysm is at risk of rupturing. If an aneurysm ruptures, blood spills into the space between the skull and the brain, a serious type of stroke known as a subarachnoid hemorrhage (SAH).

Types of brain aneurysms

Saccular aneurysms, also called “berry” aneurysms because they look like berries, are the most common type of brain aneurysm. Saccular aneurysms have a “neck” that connects the aneurysm to its main (“parent”) artery and a larger, rounded area called the dome. These aneurysms bulge on only one side of the artery wall.

A less common type is a fusiform aneurysm, in which the artery is widened on both sides. Fusiform aneurysms do not have a defined neck.

This site uses cookies

Our site uses cookies to personalize features and, via third-parties, to collect metrics on usage so that we can better tailor our site to the needs of our users. You can view our full cookie and privacy policies via the links below. To fully experience our site, please click Accept.