title: Measurement system that improves the accuracy of polyp size determined at colonoscopy.
abstract: OBJECTIVE
  To assess the accuracy of polyp size using an endoscopic lesion measurement system (ELMS).
  
  
  METHODS
  The accuracy of polyp size assessment was compared among measurements acquired by visual estimation, disposable graduated biopsy forceps (DGBF; used as a "scale-plate") and the ELMS.
  
  
  RESULTS
  There were 192 polyps from 166 cases included in this study. The mean diameter of the post polypectomy measurement was 0.85±0.53 cm (range: 0.2-3.0 cm). The mean diameter by visual estimation was 1.10±0.53 cm, which was significantly different compared to the actual size of the polyp (P<0.001). The mean diameters obtained using DGBF (0.87±0.54 cm) and ELMS (0.85±0.53 cm) did not significantly differ from the actual size of the polyp. The difference between the measurements from the ELMS and DGBF was not significant.
  
  
  CONCLUSIONS
  Unlike visual estimations at colonoscopy, endoscopic graduated biopsy forceps and the endoscopic lesion measurement system are accurate methods to estimate polyp size.
authors.affiliation: Qiang Leng, Hei-Ying Jin, National Center of Colorectal Surgery, Jiangsu Integrated Colorectal Oncology Center, the Third Affiliated Hospital of Nanjing, University of Traditional Chinese Medicine, Jiangsu Province, Nanjing 210001, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Leng
authors.affiliation: Qiang Leng, Hei-Ying Jin, National Center of Colorectal Surgery, Jiangsu Integrated Colorectal Oncology Center, the Third Affiliated Hospital of Nanjing, University of Traditional Chinese Medicine, Jiangsu Province, Nanjing 210001, China.
authors.forename: Hei-Ying
authors.initials: HY
authors.lastname: Jin
mesh_terms: D018256:Adenomatous Polyps / Q000473:pathology* / Q000601:surgery; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002276:Carcinoid Tumor / Q000473:pathology* / Q000601:surgery; D003082:Colectomy / Q000379:methods; D003110:Colonic Neoplasms / Q000473:pathology* / Q000601:surgery; D003111:Colonic Polyps / Q000473:pathology* / Q000601:surgery; D020685:Colonoscopes; D003113:Colonoscopy / Q000295:instrumentation* / Q000379:methods; D004209:Disposable Equipment; D004867:Equipment Design; D005260:Female; D006801:Humans; D010535:Laparoscopy; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011446:Prospective Studies; D015203:Reproducibility of Results; D013525:Surgical Instruments; D047368:Tumor Burden; D014796:Visual Perception
keywords: Accuracy; Colonoscopy; Endoscopic lesion measurement system; Polyp size measurement