title: Selective MR imaging approach for evaluation of patients with Horner's syndrome.
abstract: OBJECTIVE
  To assess the usefulness of MR in the evaluation of patients with Horner's syndrome.
  
  
  METHODS
  We prospectively performed MR imaging in 33 patients with Horner's syndrome (13 preganglionic and 20 postganglionic) using a protocol specifically designed for pre- and postganglionic varieties of this syndrome. Assignment of patients to pre- or postganglionic categories was performed on the basis of pharmacologic testing.
  
  
  RESULTS
  Abnormalities in one-half of the patients with preganglionic Horner's syndrome included lateral medullary infarct, spinal cord/root disease, apical lung tumor, and paravertebral metastatic mass. Three of 20 patients with postganglionic Horner's syndrome had carotid artery dissection.
  
  
  CONCLUSIONS
  Routine scanning of patients who have postganglionic Horner's syndrome with cluster headaches was not helpful in our small series.
authors.affiliation: Department of Ophthalmology and Neurology, University of Utah School of Medicine, Salt Lake City 84132.
authors.forename: K B
authors.initials: KB
authors.lastname: Digre
authors.forename: W R
authors.initials: WR
authors.lastname: Smoker
authors.forename: P
authors.initials: P
authors.lastname: Johnston
authors.forename: M R
authors.initials: MR
authors.lastname: Tryhus
authors.forename: H S
authors.initials: HS
authors.lastname: Thompson
authors.forename: T A
authors.initials: TA
authors.lastname: Cox
authors.forename: W T
authors.initials: WT
authors.lastname: Yuh
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D005260:Female; D006732:Horner Syndrome / Q000175:diagnosis* / Q000453:epidemiology; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies