Gastroenterology 2016;-:1–3

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SELECTED SUMMARIES Philip S. Schoenfeld, Section Editor John Y. Kao, Section Editor STAFF OF CONTRIBUTORS Joseph Anderson, White River Junction, VT Johanna L. Chan, Houston, TX Matthew A. Ciorba, St. Louis, MO Massimo Colombo, Milan, Italy Gregory A. Cote, Charleston, SC Evan S. Dellon, Chapel Hill, NC Alex Ford, Leeds, United Kingdom Lauren B. Gerson, San Francisco, CA David S. Goldberg, Philadelphia, PA Samir Gupta, San Diego, CA

Reena Khanna, London, Ontario, Canada W. Ray Kim, Rochester, MN Paul Y. Kwo, Indianapolis, IN Uma Mahadevan, San Francisco, CA Baha Moshiree, Miami, FL Swati G. Patel, Ann Arbor, MI Laurent Peyrin-Biroulet, Vandoeuvre-lès-Nancy, France Jesus Rivera-Nieves, San Diego, CA

Endoscopic Measurement of Colorectal Polyps: How Do We Measure Up? Anderson BW, Smyrk TC, Anderson KS, et al. Endoscopic overestimation of colorectal polyp size. Gastrointest Endosc 2015;83:201–2088. Accurate measurement of polyp size is crucial to screening or surveillance for colorectal cancer (CRC). Adenoma size has been shown to be an important predictor of long-term CRC risk (N Engl J Med 1992;326:658–662). Accordingly, adenomas that are measured as 1 cm may warrant shorter surveillance intervals than smaller polyps, as recommended by the United States Multicenter Task Force guidelines (Gastroenterology 2012;143:844–857). Owing to technical issues, such as polyp fragmentation, the endoscopist’s assessment is often the only measurement of polyp size in clinical practice. Since the nascent stages of endoscopy, there have been concerns regarding the endoscopic measurement of polyps (Dis Colon Rectum 1982;25:669–672). Many of the earlier studies examining the accuracy of endoscopists in assessing polyp size have suffered from low numbers of polyps in their analyses (Gastrointest Endosc 1997;46:492–496; Gastrointest Endosc 1997;46:497–502). Polyp size measurement, which may be subjective, can have a large impact on CRC risk stratification and recommended surveillance intervals. One study reported that nearly half of all exams with polypectomies resulted in earlier surveillance owing to inaccurate size measurements (Dis Colon Rectum 2013;56:315–321). In the present study, the authors examine and compare the measurement of polyp size by endoscopists and pathologists for polyps removed in 2012 at the Mayo Clinic in Rochester (Gastrointest Endosc 2015;83:201–8). The authors also examined endoscopist- and polyp-related factors that may be associated with inaccurate endoscopic polyp size estimation. In their analysis, the authors included only those polyps which were removed in toto and had both endoscopic and pathologic size estimation. In adults with multiple polyps, only the largest lesion meeting inclusion criteria was included. As part of the center’s usual routine, polyps were placed in formalin immediately after resection and sent

Sameer Saini, Ann Arbor, MI Ekihiro Seki, Los Angeles, CA Amit Singal, Dallas, TX Ryan W. Stidham, Ann Arbor, MI Akbar Waljee, Ann Arbor, MI Sachin Wani, Aurora, CO Alastair J. M. Watson, Norwich, United Kingdom Yana Zavros, Cincinnati, OH

to pathology for processing. Objective pathologic size, measured with a ruler to the nearest millimeter, was defined as the “gold standard.” Polyp sizes were dichotomized into those that were

Endoscopic Measurement of Colorectal Polyps: How Do We Measure Up?

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