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Endoscopic resection of large colorectal adenomas - clinical experience of a tertiary referral centre.

AIM: Colorectal cancer is a leading cause of cancer-related mortality. Adenomatous polyps are typically resected endoscopically to prevent cancer while giant and complex polyps are managed surgically. No criteria clearly define the indications for surgical vs endoscopic resection. Our aim was to evaluate factors associated with the short-term efficacy and safety of endoscopic resection of large (≥ 20 mm) and giant (≥ 40 mm) adenomas.

METHOD: Consecutive cases with colonic adenomas larger than 20 mm resected endoscopically were included. Endoscopic, clinical and histological details of polyps were recorded as well as the need for surgical resection.

RESULT: A total of 351 resections were included. The average adenoma diameter was 30.34 ± 10.66 mm. Surgery was recommended in 21 (5.98%) cases. In a multivariate analysis for efficacy, two variables were independent risk factors for surgery: adenoma size [OR 1.08 (95% CI: 1.04-1.12)] and caecal location [5.97(1.60-22.33)]. Postpolypectomy complications were documented in 85 (24.2%) cases: bleeding 69 (19.7%), perforations 8(2.3%) and significant discomfort 15(4.3%). Twenty-one patients (6.0%) developed serious complications requiring further hospitalization. In multivariate analysis for safety, independent risk factors for postpolypectomy complications included adenoma size [1.04 (1.06-1.01)], polyp morphology [sessile 2.55 (1.45-4.51), flat 2.40 (1.04-5.52)] and submucosal adrenaline injection [1.87 (1.11-3.20)]. Increments of 1 mm in adenoma diameter beyond 20 mm increased the need for surgery by 8% and the risk of complications by 4%.

CONCLUSION: Resection of large or giant adenomas is generally a safe procedure. Although adenoma size and morphology are significant predictors of efficacy and safety, each case should be individually evaluated in a specialist unit for feasibility of endoscopic resection.

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