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Endoscopic submucosal dissection in a case of semicircular esophageal squamous cell carcinoma, approximately 7 cm wide. Choromoendoscopy with an iodine solution revealed the iodine unstained area spreading three-quarter of circumference of the esophagus (A). En bloc removal of the lesion was achieved in circumference (B). Resected specimen removed by ESD showed complete resection with the tumor-free margin (C).
