title: Tumour extent and T stage of nasopharyngeal carcinoma: a comparison of magnetic resonance imaging and computed tomographic findings.
abstract: OBJECTIVE
  To compare magnetic resonance imaging (MRI) and computed tomography (CT) in defining the T stage and full tumour extent of nasopharyngeal carcinoma.
  
  
  METHODS
  Forty-eight patients with pathologically proven nasopharyngeal carcinoma underwent MRI and CT examinations within 2 weeks of each other. Contrast medium was used in both examinations. The T stage and full tumour extent according to MRI and CT were compared.
  
  
  RESULTS
  In 32 patients MRI and CT findings agreed completely. MRI findings resulted in assignment of a higher stage than CT findings in another 8 patients. In the remaining 8 patients MRI showed wider tumour spread than CT, although there was no discordance in the T stage assigned.
  
  
  CONCLUSIONS
  When compared with CT in defining the full tumour extent and assigning the T stage in 48 patients with nasopharyngeal carcinoma, MRI showed more extensive disease in 16 patients, including 8 in whom the T stage was revised upward. Therapy was altered as a result of the MRI findings.
authors.affiliation: Department of Diagnostic Imaging, Vancouver Cancer Centre, BC.
authors.forename: P Y
authors.initials: PY
authors.lastname: Poon
authors.forename: V H
authors.initials: VH
authors.lastname: Tsang
authors.forename: P L
authors.initials: PL
authors.lastname: Munk
mesh_terms: D000328:Adult; D000368:Aged; D002277:Carcinoma / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology* / Q000556:secondary; D003287:Contrast Media; D005260:Female; D006801:Humans; D008207:Lymphatic Metastasis / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009303:Nasopharyngeal Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology*; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media