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Endoscopic overestimation of colorectal polyp size.

Abstract：

BACKGROUND AND AIMS:Polyp size ≥ 1 cm triggers more frequent colonoscopic surveillance, yet size is typically based on subjective endoscopic estimates. We sought to compare contemporary assessments of polyp size by endoscopic estimation and pathology measurement. METHODS:Colonoscopy and pathology reports were reviewed from the 2012 medical records at a large institution. Only polyps resected in toto with both endoscopic estimates and pathology measurements were included. Pathology measurements were considered the criterion standard. Factors affecting endoscopic miscall rates were assessed by multivariate analyses. RESULTS:From 6067 polyps resected, both endoscopic and pathology sizes were available on 1528. Distribution of polyp size appraised by endoscopy but not by pathology revealed modal clustering, particularly around 1 cm. Among 99 polyps endoscopically called 1 cm, 72% were <1 cm on pathology. Of all 222 polyps estimated as ≥ 1 cm on endoscopy, 46% were <1 cm on pathology; of 1306 polyps estimated as <1 cm, 3.9% were ≥ 1 cm on pathology. By histology, 39% of adenomatous, 59% of sessile serrated, and 73% of hyperplastic polyps were overcalled; P = .008. By configuration, 34% of pedunculated, 49% of sessile, and 61% of flat polyps were overcalled; P = .014. Endoscopic overestimation was more common in women (54%) than in men (40%) (P = .03) and with proximal (56%) than distal (40%) sites; P = .02. Miscall rates were unaffected by endoscopist covariates. CONCLUSIONS:Substantial discordance exists between endoscopic and pathology-based assessments of polyp size. Almost half of polyps called advanced on endoscopic estimates of size ≥ 1 cm fell below this threshold on actual pathology measurements.

journal_name

Gastrointest Endosc

journal_title

Gastrointestinal endoscopy

authors

Anderson BW,Smyrk TC,Anderson KS,Mahoney DW,Devens ME,Sweetser SR,Kisiel JB,Ahlquist DA

doi

10.1016/j.gie.2015.06.058

subject

Has Abstract

pub_date

2016-01-01 00:00:00

pages

201-8

issue

1

eissn

0016-5107

issn

1097-6779

pii

S0016-5107(15)02630-9

journal_volume

83

pub_type

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