McWhinney, Connor D.Vemulapalli, Krishna C.El-Rahyel, AhmedAbdullah, NoorRex, Douglas K.2020-10-302020-10-302020McWhinney, C. D., Vemulapalli, K. C., El-Rahyel, A., Abdullah, N., & Rex, D. K. (2020). Adverse events and residual lesion rate after cold endoscopic mucosal resection of serrated lesions ≥10 mm. Gastrointestinal Endoscopy. https://doi.org/10.1016/j.gie.2020.08.032https://hdl.handle.net/1805/24218Background and Aims Cold endoscopic mucosal resection (EMR) is being increasingly used for large serrated lesions. We sought to measure residual lesion rates and adverse events after cold EMR of large serrated lesions. Methods In a single academic center, we retrospectively examined a database of serrated class lesions ≥ 10 mm removed with cold EMR for safety and efficacy. Results Five hundred and sixty-six serrated lesions ≥10 mm in size were removed from 312 patients. We successfully contacted 223 patients (71.5%) with no reported serious adverse events that required hospitalization, repeat endoscopy, or transfusion. The residual lesion rate per lesion at first follow-up colonoscopy was 18 out of 225 (8%; 95% CI, 5-12.1). Lesions with residual were larger at polypectomy compared with lesions without recurrence (median, 23 mm vs 16 mm, p=0.017). Conclusion Cold EMR appears to be safe and effective for the removal of large serrated lesions.enPublisher Policycold endoscopic mucosal resectionsessile serrated lesionsresidual lesion ratesArticle