A Brain Aneurysm (image) University of Helsinki Caption Approximately one-third of all aneurysms and up to one fourth of small aneurysms will rupture during a patient's lifetime. Credit Miikka Korja / University of Helsinki Usage Restrictions the image may only be used with appropriate caption or credit. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.