Brain aneurysms, which affect as many as one in 50 people, occur when a blood vessel wall weakens and bulges, setting the scene for a potentially deadly rupture. Now scientists have created a 3-D-printed aneurysm model in the laboratory and “operated” on it: they inserted a device to seal it off and prevent it from bursting. Such models could be tailored to replicate an individual patient’s blood vessel, letting doctors try different treatments and find the best solution.

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By Tanya Lewis | Scientific American February 2021 Issue