When patients learn they have a brain aneurysm, their medical records will indicate the size of the aneurysm in millimeters. Aneurysms are usually classified by size:
- Small = less than 7 millimeters in diameter
- Medium = 7-12 millimeters
- Large = 13-24 millimeters
- Giant = more than 25 millimeters
According to Mayfield Brain & Spine in Cincinnati, Ohio, generally, the larger the aneurysm (>12mm), the higher risk of rupture.
We’ve included a visual representation of sizes in millimeters compared to commonly-known items as a guide.
