title: Local staging of anal and distal colorectal tumors with the magnetic resonance endoscope.
abstract: BACKGROUND
  We prospectively assessed the feasibility and accuracy of endoscopic magnetic resonance (EMR) scanning in the local staging of anal and colorectal cancer as compared to endosonography.
  
  
  METHODS
  Fifteen patients with biopsy-proven anal (n = 2), rectal (n = 11), and distal colonic (n = 2) cancer underwent endosonography followed by EMR imaging. Scans were acquired using the magnetic resonance receiver coil incorporated into the tip of the non-ferromagnetic endoscope. Blinded to endosonography results, two radiologists interpreted the EMR images using the TNM system. Staging results were compared to endosonography in all patients and to histopathology in the 13 colorectal cases.
  
  
  RESULTS
  EMR imaging, well tolerated in all patients, correlated with endosonography in 10 of 15 and 12 of 15 cases for T- and N-staging, respectively. In the 13 colorectal patients with available histopathology, accuracy of EMR and of endosonography in T-staging was 77% and 85%, respectively; N-staging accuracy was 62% for both.
  
  
  CONCLUSIONS
  For anal and distal colorectal neoplasms, EMR imaging is feasible and provides local staging comparable to endosonography.
authors.affiliation: Department of Medicine, Medical University of South Carolina, Charleston 29425, USA.
authors.forename: D
authors.initials: D
authors.lastname: Kulling
authors.forename: D R
authors.initials: DR
authors.lastname: Feldman
authors.forename: C L
authors.initials: CL
authors.lastname: Kay
authors.forename: D E
authors.initials: DE
authors.lastname: Bohning
authors.forename: B J
authors.initials: BJ
authors.lastname: Hoffman
authors.forename: A K
authors.initials: AK
authors.lastname: Van Velse
authors.forename: P L
authors.initials: PL
authors.lastname: Baron
authors.forename: C J
authors.initials: CJ
authors.lastname: Lahr
authors.forename: R H
authors.initials: RH
authors.lastname: Hawes
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001005:Anus Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis; D020685:Colonoscopes; D015179:Colorectal Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D019160:Endosonography / Q000295:instrumentation*; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011446:Prospective Studies