title: Flat colorectal lesions: colonoscopic detection without dye spray or magnification and clinical significance.
abstract: OBJECTIVE
  The detection of flat colorectal lesions with possible malignant potential has been described by Japanese endoscopists. This study looks at the detection of flat lesions using standard colonoscopic techniques and examines the clinical significance of these lesions.
  
  
  METHODS
  The records of patients who underwent complete colonoscopy by a single colorectal surgeon in an outpatient setting over a 4-year period were reviewed. The site and number of flat lesions and their histology were noted. Patients with incomplete intubation of the colon were excluded.
  
  
  RESULTS
  A total of 491 patients underwent 593 colonoscopic examinations. There were 236 flat lesions identified in 91 patients: 24% (56/236) were adenomas showing mild or moderate dysplasia, and 63% (148/236) were hyperplastic.
  
  
  CONCLUSIONS
  Flat colorectal lesions are common and can be detected without the aid of dye spray and magnification. One-quarter of these lesions are adenomatous and we recommend routine hot biopsy or polypectomy of these lesions.
authors.affiliation: Division of Colorectal Surgery, Department of Surgery, National University Hospital, Singapore. kutts_shen@hotmail.com
authors.forename: Kutt-Sing
authors.initials: KS
authors.lastname: Wong
authors.forename: Wei-Chong
authors.initials: WC
authors.lastname: Chua
authors.forename: Denis Mun-Onn
authors.initials: DM
authors.lastname: Cheong
authors.forename: Richard
authors.initials: R
authors.lastname: Sim
authors.forename: Wai-Ming
authors.initials: WM
authors.lastname: Yap
mesh_terms: D000236:Adenoma / Q000175:diagnosis; D003106:Colon / Q000473:pathology; D003110:Colonic Neoplasms / Q000175:diagnosis*; D003113:Colonoscopy; D005260:Female; D006801:Humans; D007413:Intestinal Mucosa / Q000473:pathology; D008297:Male; D008875:Middle Aged; D012004:Rectal Neoplasms / Q000175:diagnosis*; D012007:Rectum / Q000473:pathology