title: High-resolution T2-weighted (T2W) oblique plane turbo spin-echo (TSE) MRI for rectal adenocarcinoma staging.
abstract: OBJECTIVE
  The purpose of this study was to determine the frequency/significance of incorrectly planned oblique T2-weighted (T2W) MRI of rectal adenocarcinoma.
  
  
  METHODS
  Eighty-six consecutive patients underwent MRI for rectal cancer staging. Two radiologists evaluated oblique T2W imaging and tumor stage.
  
  
  RESULTS
  A total of 71% of middle/high tumors had correctly planned oblique T2W-MRI. Thirteen of 14 low tumors (N=7) or tumors spanning at least two rectal segments (N=7) had incorrectly planned oblique T2W-MRI. The sensitivity/specificity of staging on correct compared to incorrect oblique T2W was: 88.9/50% (R1)/77.8/60% (R2) and 80/100% (R1)/60/80% (R2), (P=.54). Agreement was substantial, K=0.67.
  
  
  CONCLUSIONS
  Oblique T2W-MRI is incorrectly performed in low tumors and those spanning multiple rectal segments. In this study, planning errors did not impact staging accuracy.
authors.affiliation: Department of Diagnostic Imaging, The Ottawa Hospital, 1053 Carling Avenue, Ottawa, ON, K1Y 4E9, Canada. Electronic address: cvanderpol@toh.on.ca.
authors.forename: Christian B
authors.initials: CB
authors.lastname: van der Pol
authors.affiliation: Department of Diagnostic Imaging, The Ottawa Hospital, 1053 Carling Avenue, Ottawa, ON, K1Y 4E9, Canada. Electronic address: wshabana@toh.on.ca.
authors.forename: Wael M
authors.initials: WM
authors.lastname: Shabana
authors.affiliation: Department of Diagnostic Imaging, The Ottawa Hospital, 1053 Carling Avenue, Ottawa, ON, K1Y 4E9, Canada. Electronic address: mmcinnes@toh.on.ca.
authors.forename: Matthew D
authors.initials: MD
authors.lastname: McInnes
authors.affiliation: Department of Diagnostic Imaging, The Ottawa Hospital, 1053 Carling Avenue, Ottawa, ON, K1Y 4E9, Canada. Electronic address: nschieda@toh.on.ca.
authors.forename: Nicola
authors.initials: N
authors.lastname: Schieda
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology*; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D012004:Rectal Neoplasms / Q000473:pathology*; D012680:Sensitivity and Specificity
keywords: Magnetic resonance imaging (MRI); Rectal adenocarcinoma; Staging; T2 weighted