title: Chiari Malformation Type I Presenting as Cluster-like Headache.
abstract: OBJECTIVE
  Although different types of headache have been described in Chiari malformation type I, reports of cluster-like headaches are rare.
  
  
  METHODS
  We report a 26-year-old man who presented with a two-week history of excruciating headache in the right temporal region after coughing, which was accompanied by autonomic features including right-sided nasal congestion and tearing from his right eye. Sensory deficits in the first branch of the right trigeminal nerve and along C3-5 dermatomes were noted, and brain magnetic resonance imaging was compatible with a diagnosis of Chiari malformation type I.
  
  
  CONCLUSIONS
  A diagnosis of secondary cluster headache was made due to a lack of typical periodicity, and the presence of anhidrosis and sensory abnormalities and cough headache.
authors.affiliation: Division of Neurology, Department of Internal Medicine, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chiayi City, Taiwan.
authors.forename: Yuan-Hua
authors.initials: YH
authors.lastname: Kao
authors.affiliation: Division of Neurology, Department of Internal Medicine, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chiayi City, Taiwan.
authors.forename: Yung-Chu
authors.initials: YC
authors.lastname: Hsu
mesh_terms: D000328:Adult; D001139:Arnold-Chiari Malformation / Q000150:complications* / Q000000981:diagnostic imaging; D003027:Cluster Headache / Q000209:etiology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male