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Endoscopic submucosal dissection procedure of an esophageal squamous cell carcinoma in the proximal esophagus. (A) White light endoscopy. (B) Narrow-band imaging. (C) Resection ulcer after endoscopic submucosal dissection. (D) Histology showing esophageal squamous cell carcinoma restricted to the mucosa (M1) without lymphovascular invasion (absolute indication for endoscopic resection; hematoxylin and eosin stain, ×40).
