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Endoscopic submucosal dissection for esophageal cancer. A: Depressed area at the center of the lesion became noticeable during the course of submucosal dissection (blue arrow); B: Muscularis propria layer abruptly ended at the center of the cancer lesion. The red arrow indicates the muscularis propria layer, and the yellow arrow indicates the area of the muscularis propria layer defect.
