title: Preoperative staging of rectal carcinoma by magnetic resonance imaging with a pelvic phased-array coil.
abstract: BACKGROUND
  The use of surface coils for magnetic resonance imaging (MRI) allows enhanced image definition and so potentially more accurate staging of colorectal cancer. Endorectal coil imaging is invasive, operator dependent and impossible in a high proportion of patients due to rectal stricture. The phased-array pelvic coil, however, is non-invasive and applicable to all rectal tumours.
  
  
  METHODS
  A pelvic phased-array coil was used for preoperative MRI staging of 38 primary rectal carcinomas. Results were expressed according to the Dukes and tumour nodes metastasis (TNM) classifications. After resection of the tumour, the stage predicted on MRI was compared with the pathological classification.
  
  
  RESULTS
  The overall accuracy of preoperative staging with the pelvic phased-array coil was 55 per cent for both Dukes class and T stage. Assessment of nodal involvement gave an overall accuracy for MRI of 76 per cent with a sensitivity of 57 per cent and specificity of 88 per cent.
  
  
  CONCLUSIONS
  Use of a pelvic phased-array coil did not improve the staging accuracy of MRI to a clinically useful level.
authors.affiliation: University of Hull Academic Surgical Unit, Castle Hill Hospital, Cottingham, North Humberside, UK.
authors.forename: M B
authors.initials: MB
authors.lastname: Hadfield
authors.forename: A A
authors.initials: AA
authors.lastname: Nicholson
authors.forename: A W
authors.initials: AW
authors.lastname: MacDonald
authors.forename: R
authors.initials: R
authors.lastname: Farouk
authors.forename: P W
authors.initials: PW
authors.lastname: Lee
authors.forename: G S
authors.initials: GS
authors.lastname: Duthie
authors.forename: J R
authors.initials: JR
authors.lastname: Monson
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods* / Q000592:standards; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging / Q000379:methods*; D011300:Preoperative Care; D012004:Rectal Neoplasms / Q000473:pathology* / Q000601:surgery; D012680:Sensitivity and Specificity