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An 82-year-old woman presented for a periodic endoscopic examination after radiotherapy and endoscopic mucosal resection (EMR) of a cancer in the esophagus. Conventional endoscopy demonstrated a tiny, flat, reddish lesion about 1 mm in diameter proximal to the scar of the previous esophageal EMR. Observation after iodine staining showed an apparent unstained area in the lesion. Magnifying observation...
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