Optimizing Resection of Large Colorectal Polyps

Abstract

Polypectomy reduces the incidence and mortality of colorectal cancer (CRC). The widespread adoption of CRC screening, more rigorous colonoscopy techniques, and advancements in endoscopic imaging have led to a greater awareness of complex polyps. Whereas surgery was once considered necessary for many large sessile or laterally spreading lesions (LSLs) in the colorectum, the majority can now be removed endoscopically. Endoscopic mucosal resection (EMR) is an established technique for treatment of colorectal LSLs. When performed by experts, EMR is highly effective and safe and can be completed in an outpatient or day-stay setting. Advancements in EMR effectiveness encompass a better understanding of the factors leading to post-EMR recurrence, protocols to recognize and treat it, and interventions that prevent recurrent or residual adenoma. New techniques for treating intra-procedural bleeding and a novel classification system to identify and inform proactive management of deep mural injury enhance the safety profile of EMR. However, each of these incremental advancements necessitates a meticulous and systematic approach that only committed and properly trained endoscopists can master. While alternative interventions such as endoscopic submucosal dissection (ESD) offer potential advantages over EMR, the added procedural complexity, risks, and costs limit the relevance of ESD to a minority of lesions in the colorectum. This article reviews the expanding body of evidence supporting EMR as the first-line treatment of colorectal LSLs ≥20 mm.

Keywords: Adverse events; Colorectal polyps; Effectiveness; Endoscopic mucosal resection; Endoscopic submucosal dissection; Laterally spreading lesion; Polypectomy.