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This study measures the "tortuosity" or twistedness of brain arteries to determine if increased tortuosity is predictive of intracranial aneurysm development. Researchers will compare the tortuosity of 500 high-risk patients to normal-risk patients and establish a tortuosity risk indicator. Tortuosity will be measured using a "distance factor metric" that divides the actual path length of the artery by the straight line distance between endpoints.










