title: [The diagnostic value of magnetic resonance sialography for chronic obstructive parotitis].
abstract: OBJECTIVE
  To evaluate the diagnostic value of magnetic resonance sialography (MRS) for chronic obstructive parotitis (COP).
  
  
  METHODS
  18 patients with COP underwent both conventional sialography and MRI sialography. A new magnetic resonance technique was applied. In addition to the usually performed T1 and T2 cross-sectional sequence, a heavy T2-weighted sequence (TR=4000 msec,TE=250 msec)was performed that allowed depiction of the fluid-filled parotid duct system. The MRI sialographic findings were compared with that of conventional sialography. The overall accuracy of diagnosis and ductal stenosis were assessed.
  
  
  RESULTS
  The main duct of the parotid gland as well as primary branching ducts could be reliably depicted. Compared with the conventional sialography, the diagnostic accuracy of MRS was 94.4%(17/18) and stenosis diagnosis reached 100%(17/17).
  
  
  CONCLUSIONS
  Initial experience indicates that magnetic resonance sialography can be applied successfully to investigate the duct system of the parotid gland. It is completely noninvasive and a promising alternative to radiographic sialography.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Ninth People's Hospital,School of Stomatology, Shanghai Second Medical University. Shanghai 200011, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Shen
authors.forename: Chuang-qi
authors.initials: CQ
authors.lastname: Yu
authors.forename: Chi
authors.initials: C
authors.lastname: Yang
authors.forename: Bei-ping
authors.initials: BP
authors.lastname: Hu
authors.forename: Ling-yan
authors.initials: LY
authors.lastname: Zheng
mesh_terms: D000293:Adolescent; D000328:Adult; D002908:Chronic Disease; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010309:Parotitis / Q000175:diagnosis*; D012796:Sialography / Q000379:methods*