Prevalence of sessile serrated adenoma/polyp in hyperplastic-appearing diminutive rectosigmoid polyps

Abstract

The American Society for Gastrointestinal Endoscopy recommends that distal colon hyperplastic lesions can be left in place without resection if adenomatous histology can be excluded with >90% negative predictive value. However, some lesions could be sessile serrated adenomas/polyps (SSA/Ps), which is also precancerous. The aim of this study was to describe the prevalence of SSA/Ps in hyperplastic-appearing diminutive rectosigmoid polyps. We prospectively placed 513 consecutive diminutive rectosigmoid polyps that appeared hyperplastic to an expert endoscopist in individual bottles for pathologic. Each polyp was examined by 3 expert GI pathologists. The prevalence of SSA/P in the study polyps ranged from .6% to 2.1%. The lowest negative predictive value found by the endoscopist for the combination of adenomas plus SSA/Ps was 96.7%. The prevalence of SSA/Ps in diminutive rectosigmoid hyperplastic-appearing polyps is very low. These results support the safety and feasibility of a "do not resect" policy for diminutive hyperplastic-appearing rectosigmoid polyps.