A 3D-printed model of the blood vessels inside a woman’s brain has helped surgeons practise life-saving surgery. The surgeons needed to operate to correct a weakness, or aneurysm, in a blood vessel inside the patient’s head. Scans of the aneurysm revealed that the usual approach surgeons would take to fix it would not have worked.3D printing is increasingly finding a role in medicine to either help doctors prepare before carrying out procedures or to make prosthetics.

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