U.S. headache sufferers get $1 billion worth of brain scans each year

One in eight visits to a a doctor for a headache or migraine end up with the patient going for a brain scan, at a total cost of about $1 billion a year, a new study finds. And many of those MRI and CT scans -- and costs -- are probably unnecessary, given the very low odds that serious issues lurk in the patients' brains.