Tortuosity Summary

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.