AN ESOPHAGEAL SUBMUCOSAL tumor (SMT) measuring 30 mm in diameter was detected in a 62year-old woman who presented with dysphagia (Fig. 1a). The lesion was hard, and endoscopic ultrasound showed that it was continuous with the fourth layer mainly in the second and third layers (Fig. 1b). Endoscopic ultrasound-guided fine-needle aspiration biopsy confirmed granular cell tumor (GCT) (Fig. 1c). The patient refused surgery; therefore, endoscopic resection (ER) under general anesthesia was scheduled after sufficient informed consent. The entire procedure is presented in Video S1. The endo-devices used were dual knife and IT-nano (Olympus, Tokyo, Japan), and local injection was done using hyaluronic acid. After making incision and sufficient trimming on the anal side, incision and dissection were carried out from the oral side. Wide myotomy of not only

中文翻译：

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食管黏膜下肿瘤内镜全层切除术

在一名出现吞咽困难的 62 岁女性中检测到一个直径为 30 毫米的食管黏膜下肿瘤（SMT）（图 1a）。病灶较硬，内镜超声显示与第四层连续，主要在二、三层（图1b）。内镜超声引导下细针穿刺活检证实颗粒细胞瘤（GCT）（图 1c）。患者拒绝手术；因此，在充分知情同意后，安排了全身麻醉下的内镜切除术（ER）。整个过程在视频 S1 中介绍。使用的内科设备是双刀和 IT-nano（奥林巴斯，东京，日本），局部注射是使用透明质酸完成的。肛侧切开并充分修整后，从口侧切开。宽肌切开术不仅