Brain aneurysms often go unnoticed by those afflicted by them. Unless an aneurysm ruptures, patients can go about their day, completely unaware of the deadly vascular defect.

Functioning blood vasculature allows blood to flow like rivers, says Chris Bettinger, an associate professor of materials science and engineering and biomedical engineering. An aneurysm occurs when the weakened vessels lead to a bulge in vasculature, causing blood to pool in the bulge, much like stagnant bogs might form after part of a riverbank collapses.

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By Jacob Williamson-Rea