title: MR imaging of the parotid gland in Sjögren's syndrome: a proposal for new diagnostic criteria.
abstract: OBJECTIVE
  Because classic diagnostic techniques for sjögren's syndrome (SS) are invasive and require radiation exposure, a noninvasive diagnostic method might benefit patients with SS. The purpose of this study was to determine whether quantitative analysis of MR images of the parotid gland can differentiate patients with SS from normal subjects.
  
  
  METHODS
  We performed quantitative analysis of MR images of the parotid gland for 40 patients with definite and probable SS, for 30 normal subjects matched by age and sex to the SS patients, and for 10 patients with parotid inflammation. MR images of teh parotid gland were assessed by calculating standard deviations (SD) of signal intensity.
  
  
  RESULTS
  SD of signal intensity exclusively (p < .0001) separated MR images of the parotid glands of patients with definite SS from those of normal subjects. SD of signal intensity for the parotid glands of patients with probable SS also were significantly higher (p < .001) than those of normal subjects. Changes in signal intensity were specific for SS and did not occur with parotid inflammation. Tentative categorization on the basis of signal intensity patterns on MR images of the parotid glands of SS patients showed a high correlation with the results of labial gland biopsy (r = .834) and sialography (r = .936).
  
  
  CONCLUSIONS
  Taken together, these results conclusively indicate that quantitative analysis of MR images for SD of signal intensity is useful method for diagnosing SS and can replace classic methods, which are invasive.
authors.affiliation: Department of Radiology, Nagasaki University School of Dentistry, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Izumi
authors.forename: K
authors.initials: K
authors.lastname: Eguchi
authors.forename: M
authors.initials: M
authors.lastname: Ohki
authors.forename: M
authors.initials: M
authors.lastname: Uetani
authors.forename: K
authors.initials: K
authors.lastname: Hayashi
authors.forename: M
authors.initials: M
authors.lastname: Kita
authors.forename: S
authors.initials: S
authors.lastname: Nagataki
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001706:Biopsy; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010306:Parotid Gland / Q000473:pathology*; D012680:Sensitivity and Specificity; D012796:Sialography; D012859:Sjogren's Syndrome / Q000175:diagnosis* / Q000000981:diagnostic imaging