The objectives of this evidence based review are:<BR/>To determine the effectiveness of computed tomography (CT) and magnetic resonance imaging (MRI) scans in the evaluation of persons with a chronic headache and a normal neurological examination.<BR/>To determine the comparative effectiveness of CT and MRI scans for detecting significant intracranial abnormalities in persons with chronic headache and a normal neurological exam.<BR/>To determine the budget impact of CT and MRI scans for persons with a chronic headache and a normal neurological exam.