title: Preoperative localization of distal colorectal tumours.
abstract: BACKGROUND
  The detection of true localization of the tumour are crucial to driving the proper treatment algorithm in distally-located colorectal cancers (CRCs). The performance of four methods; colonoscopy, computed tomography (CT), magnetic resonance imaging (MRI), and fluoro-deoxy-glucose-positron emission tomography scan (FDG/PET-CT), were evaluated to identify the localizations of distal colorectal malignancies according to the rectum, sigmoid colon and recto- sigmoid junction (RSJ).
  
  
  METHODS
  Medical records of patients who underwent colorectal surgery for tumours located on the sigmoid colon, RSJ, or rectum were reviewed retrospectively.
  
  
  METHODS
  In total, 156 patients were included in the study. In terms of overall accuracy, colonoscopy, CT, MRI and FDG/PET-CT had similar accuracy rates, with 74%, 67%, 75%, and 74%, respectively. Colonoscopy was relatively less sensitive for rectosigmoid tumours (33%), while CT was less sensitive for rectal tumours (26%). MRI was less specific for tumours located on the rectum (33%).
  
  
  CONCLUSIONS
  It is crucial to correctly identify the location of distal colorectal tumours in order to plan accurate treatment strategies. Preoperative modalities, including colonoscopy, CT, MRI, and FDG/PET-CT, do not provide excellent accuracy for tumours of the distal colorectal tumours. To increase the success of these modalities; combined use could be more successful.
  
  
  BACKGROUND
  Colonoscopy, Computed tomography Distal colorectal cancer, Magnetic resonance imaging.
authors.forename: Savas
authors.initials: S
authors.lastname: Bayrak
authors.forename: Erdem
authors.initials: E
authors.lastname: Kinaci
authors.forename: Abdulkerim
authors.initials: A
authors.lastname: Ozakay
authors.forename: Ceyda Turan
authors.initials: CT
authors.lastname: Bektas
authors.forename: Aytul Hande
authors.initials: AH
authors.lastname: Yardimci
authors.forename: Esra
authors.initials: E
authors.lastname: Arslan
authors.forename: Mert Mahsuni
authors.initials: MM
authors.lastname: Sevinc
authors.forename: Hasan
authors.initials: H
authors.lastname: Bektas
mesh_terms: D000368:Aged; D003113:Colonoscopy; D015179:Colorectal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000601:surgery; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D008297:Male; D000072078:Positron Emission Tomography Computed Tomography; D011300:Preoperative Care; D019275:Radiopharmaceuticals; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed
chemical_list: D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18