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Figure 1: (a) Intraluminal ultrasound suggested that the lesion was confined in the mucosal layer; (b) Tumor boundary was marked under narrow band imaging; (c) Tissue elevation was achieved after submucosal fluid injection with HybridKnife; (d and e) Submucosal incision with HybridKnife; (f) narrow band imaging was applied again after en-bloc resection of tumor to confirm that there were no more lesions left; (g) Superficial muscular layer was shown after en-bloc resection; (h) Spreading and fixation of tumor tissue

Figure 1: (a) Intraluminal ultrasound suggested that the lesion was confined in the mucosal layer; (b) Tumor boundary was marked under narrow band imaging; (c) Tissue elevation was achieved after submucosal fluid injection with HybridKnife; (d and e) Submucosal incision with HybridKnife; (f) narrow band imaging was applied again after en-bloc resection of tumor to confirm that there were no more lesions left; (g) Superficial muscular layer was shown after en-bloc resection; (h) Spreading and fixation of tumor tissue