Typical endoscopic views of the esophagus in a patient in the injection group. a. A superficial esophageal carcinoma in the middle esophagus. The entire circumference of the lesion was marked out by electrocautery using a needle-knife at least 1 mm from the tumor border, confirmed by a Lugol-unstained region. b. This tumor encompasses half the circumference of the esophagus, as seen in the center of the lesion. c. The artificial ulcer encompassed the entire circumference after ESD. d. Injection of triamcinolone into the ulcer (white arrow).