title: Dural Thickening of the Internal Auditory Canal in Patients With Spontaneous Intracranial Hypotension Syndrome.
abstract: OBJECTIVE
  This study aimed to assess the utility of dural thickening of the internal auditory canal (IAC) in patients with spontaneous intracranial hypotension (SIH) syndrome and determined the sensitivity and specificity of this image finding.
  
  
  METHODS
  Magnetic resonance images were evaluated for 22 cases of definite SIH and 16 cases of unlikely SIH. On contrast-enhanced magnetic resonance imaging, pachymeningeal enhancement and dural thickening of the IAC were assessed.
  
  
  RESULTS
  Pachymeningeal enhancement was observed in 21 of 22 patients in the definite SIH group and 1 of 16 patients in the unlikely SIH group (sensitivity, 95.5%; specificity, 93.8%). Dural thickening of the IAC was observed in 15 of 22 patients in the definite SIH group and 0 of 16 patients in the unlikely SIH group (sensitivity, 68.2%; specificity, 100%).
  
  
  CONCLUSIONS
  Dural thickening of the IAC showed 100% specificity for SIH syndrome and can increase the accuracy of diagnosis of SIH syndrome.
authors.affiliation: From the *Department of Radiology, Nara Medical University, Nara; and †Department of Radiology, Nagoya University, Aichi, Japan.
authors.forename: Saeka
authors.initials: S
authors.lastname: Hori
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Taoka
authors.forename: Toshiteru
authors.initials: T
authors.lastname: Miyasaka
authors.forename: Tomoko
authors.initials: T
authors.lastname: Ochi
authors.forename: Masahiko
authors.initials: M
authors.lastname: Sakamoto
authors.forename: Takeshi
authors.initials: T
authors.lastname: Wada
authors.forename: Kaoru
authors.initials: K
authors.lastname: Myochin
authors.forename: Katsutoshi
authors.initials: K
authors.lastname: Takayama
authors.forename: Kimihiko
authors.initials: K
authors.lastname: Kichikawa
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003287:Contrast Media; D004388:Dura Mater / Q000473:pathology*; D007758:Ear, Inner / Q000473:pathology*; D005260:Female; D006801:Humans; D007089:Image Enhancement; D019585:Intracranial Hypotension / Q000473:pathology*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity; D013577:Syndrome; D055815:Young Adult
chemical_list: D003287:Contrast Media