Efficacy of Underwater Endoscopic Mucosal Resection for Superficial Non-Ampullary Duodenal Epithelial Tumor

• Main Authors: Masanori Furukawa, Akira Mitoro, Takahiro Ozutumi, Yukihisa Fujinaga, Keisuke Nakanishi, Koh Kitagawa, Soichiro Saikawa, Sinya Sato, Yasuhiko Sawada, Hiroaki Takaya, Kosuke Kaji, Hideto Kawaratani, Tadashi Namisaki, Kei Moriya, Takemi Akahane, Junichi Yamao, Hitoshi Yoshiji
• Format: Article
• Language: English
• Published: Hoon Jai Chun 2021-05-01
• Series: Clinical Endoscopy
• Subjects: duodenal epithelial tumor; endoscopic resection; superficial non-ampullary duodenal epithelial tumor; underwater endoscopic mucosal resection
• Online Access: http://www.e-ce.org/upload/pdf/ce-2020-147.pdf

Background/Aims Endoscopic resection (ER) for superficial non-ampullary duodenal epithelial tumors (SNADETs) is challenging. Conventional endoscopic mucosal resection (CEMR) is also problematic due to the anatomical features of the duodenum. We compared the safety and efficacy of underwater endoscopic mucosal resection (UEMR) with those of CEMR through a retrospective analysis. Methods Altogether, 44 consecutive patients with 46 SNADETs underwent ER (18 CEMR cases and 28 UEMR cases) between January 2016 and October 2019. We investigated the proportions of en bloc resection, R0 resection, complications, resection time, and total procedure time and compared the outcomes of patients from the CEMR group with those of patients from the UEMR group. Results The median tumor size was 8.0 mm (range, 2.0–20.0 mm). The UEMR group showed a higher proportion of en bloc resection (96.4% vs. 72.2%, p<0.05) and significantly lower median resection time and total procedure time (4 min vs. 9.5 min, p<0.05 and 13 min vs. 19 min, p<0.05; respectively) than the CEMR group. No complications were observed. However, two patients treated with piecemeal resection in the CEMR group had residual tumors. Conclusions UEMR is a feasible therapeutic option for SNADETs. It can be recommended as a standard treatment.