One-third of all brain aneurysms rupture: size is not a significant risk factor

Approximately one third of all brain aneurysms rupture during a patient's lifetime, resulting in a brain haemorrhage. A recent study demonstrates that, unlike what was previously assumed, the size of the aneurysm does not significantly impact the risk of rupture. The total number of individual risk factors is more important. Smoking, for example, increases the risk for ruptures, particularly in women.