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Background Endoscopic papillectomy is a standard treatment for ampullary lesions, which are typically small and confined to the papillary mound. Laterally spreading lesions (LSLs) of the papilla of Vater are a rare ampullary lesion subtype involving extensive duodenal mucosa. Data on endoscopic papillectomy outcomes for LSLs are limited. This study compared endoscopic papillectomy for ampullary LS
