What types of brain aneurysms are there?
There are 2 common types of brain aneurysms. The first and most common is called a saccular aneurysm. These are the result of a very small zone of weakness in the artery wall and develop into a sac-like structure with a narrow, well defined neck. For unclear reasons these are much more common. They are also the type that typically leak or rupture and cause a sub- arachnoid hemorrhage or bleeding in the brain.
