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How are brain aneurysms classified?

Brain aneurysms can be classified both by size and type.

Sizes are classed as small, large, and giant. Small is less than 11 millimeters, large is 11-25 millimeters, and giant is larger than 25 millimeters.

There are three types of aneurysms. The most common is saccular, also called a berry aneurysm. These small sacks of blood appear to have a neck or a stem that protrudes from the artery. The second type is a lateral aneurysm, which forms as a bulge along one side of an artery. The third type is fusiform, which is a bulge that causes all sides of an artery to bulge.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.