title: Potentials of high resolution magnetic resonance imaging versus computed tomography for preoperative local staging of colon cancer.
abstract: BACKGROUND
  Preoperative identification of locally advanced colon cancer is of importance in order to properly plan treatment.
  
  
  OBJECTIVE
  To study high resolution T2-weighted magnetic resonance imaging (MRI) versus computed tomography (CT) for preoperative staging of colon cancer with surgery and histopathology as reference standard.
  
  
  METHODS
  Twenty-eight patients with a total of 29 tumors were included. Patients were examined on a 1.5 T MR unit using a phased array body coil. T2 turbo spin-echo high resolution sequences were obtained in a coronal, transverse, and perpendicular plane to the long axis of the colon at the site of the tumor. Contrast-enhanced CT was performed using a protocol for metastasis staging. The examinations were independently evaluated by two gastrointestinal radiologists using criteria adapted to imaging for prediction of T-stage, N-stage, and extramural venous invasion. Based on the T-stage, tumors were divided in to locally advanced (T3cd-T4) and not locally advanced (T1-T3ab). Surgical and histopathological findings served as reference standard.
  
  
  RESULTS
  Using MRI, T-stage, N-stage, and extramural venous invasion were correctly predicted for each observer in 90% and 93%, 72% and 69%, and 82% and 78% of cases, respectively. With CT the corresponding results were 79% and 76%, 72% and 72%, 78% and 67%. For MRI inter-observer agreements (Kappa statistics) were 0.79, 0.10, and 0.76. For CT the corresponding results were 0.64, 0.66, and 0.22.
  
  
  CONCLUSIONS
  Patients with locally advanced colon cancer, defined as tumor stage T3cd-T4, can be identified by both high resolution MRI and CT, even when CT is performed with a metastasis staging protocol. MRI may have an advantage, due to its high soft tissue discrimination, to identify certain prognostic factors such as T-stage and extramural venous invasion.
authors.affiliation: Department of Diagnostic Radiology, Karolinska University Hospital Solna, Stockholm.
authors.forename: Erik
authors.initials: E
authors.lastname: Rollvén
authors.forename: Torbjorn
authors.initials: T
authors.lastname: Holm
authors.forename: Bengt
authors.initials: B
authors.lastname: Glimelius
authors.forename: Esther
authors.initials: E
authors.lastname: Lörinc
authors.forename: Lennart
authors.initials: L
authors.lastname: Blomqvist
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003110:Colonic Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D003287:Contrast Media; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011237:Predictive Value of Tests; D011379:Prognosis; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D003287:Contrast Media
keywords: Colon cancer; computed tomography; high resolution MRI; histopathology; neoadjuvant treatment; staging