Flat colorectal lesions: colonoscopic detection without dye spray or magnification and clinical significance.
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.
Wong
Kutt-Sing
KS
Division of Colorectal Surgery, Department of Surgery, National University Hospital, Singapore. kutts_shen@hotmail.com
Chua
Wei-Chong
WC
Cheong
Denis Mun-Onn
DM
Sim
Richard
R
Yap
Wai-Ming
WM
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