Underwater Endoscopic Mucosal Resection (UEMR) without injection for the resection of an adenoma located at the appendiceal orifice: a challenging approach - De Siena, M; Barbaro, F; Pecere, S; Schepis, T; Del Vecchio, L E; Maresca, R; Gualtieri, L; Petruzziello, L; Boskoski, I; Spada, C (Endoscopy, 2025)