title: When to obtain imaging studies in patients with headache.
authors.forename: J C
authors.initials: JC
authors.lastname: Klein
mesh_terms: D001927:Brain Diseases / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006261:Headache / Q000000981:diagnostic imaging / Q000209:etiology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D014057:Tomography, X-Ray Computed