title: Association between endolymphatic hydrops as revealed by magnetic resonance imaging and caloric response.
abstract: OBJECTIVE
  To investigate the association between the degree of endolymphatic hydrops (EH) revealed by magnetic resonance imaging (MRI) and a caloric response in the ear.
  
  
  METHODS
  Prospective diagnostic study.
  
  
  METHODS
  University hospital.
  
  
  METHODS
  Twenty-four patients with hearing loss and/or vertigo, who underwent MRI 1 day after an intratympanic gadolinium injection.
  
  
  METHODS
  MRI after intratympanic gadolinium injection and caloric testing with cool air stimulation (15°C, 6 l/min, 60 s).
  
  
  METHODS
  Association between the degree of EH and caloric responses. The degree of EH in the vestibule, in the cochlea, and in the ampulla of the lateral semicircular canal (LSC) was evaluated using MRI. The ratio of the diameter of the endolymphatic space to the diameter of the perilymphatic space was measured in the LSC ampulla.
  
  
  RESULTS
  Canal paresis (CP, >25%) was present in 15 patients and absent (CP, <25%) in 9 patients. There was no significant difference between caloric response and the degree of EH in the vestibule, the cochlea, or the LSC ampulla. The period between the onset of clinical symptoms and examination tended to be longer in the group with CP compared with the group without CP.
  
  
  CONCLUSIONS
  There was no significant association between the degree of EH and caloric response.
authors.affiliation: Department of Otorhinolaryngology, Nagoya University Graduate School of Medicine, Nagoya, Japan. masahirok@med.nagoya-u.ac.jp
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kato
authors.forename: Masaaki
authors.initials: M
authors.lastname: Teranishi
authors.forename: Naomi
authors.initials: N
authors.lastname: Katayama
authors.forename: Michihiko
authors.initials: M
authors.lastname: Sone
authors.forename: Shinji
authors.initials: S
authors.lastname: Naganawa
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Nakashima
mesh_terms: D000328:Adult; D000368:Aged; D002150:Caloric Tests; D007758:Ear, Inner / Q000473:pathology*; D018159:Endolymphatic Hydrops / Q000175:diagnosis*; D005260:Female; D034381:Hearing Loss / Q000175:diagnosis*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008575:Meniere Disease / Q000175:diagnosis; D008875:Middle Aged; D011446:Prospective Studies; D014717:Vertigo / Q000175:diagnosis