Abstract

It has been suggested that endoscopic resection may be an established treatment for gastrointestinal submucosal tumors (SMTs) without lymph node metastasis or with a very low risk of lymph node metastasis because of its high efficacy and safety [1]. However, endoscopic resection of SMTs with large diameters or in complicated locations is challenging because of the narrow operation space and the presence of adjacent vital organs [2]. In order to completely resect the tumor without damaging the surrounding vital organs, it is essential to clarify the anatomical structures of the tumor and the surrounding organs before and during the procedures.

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