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Case 2. A, B, Superficial 10-mm elevated and depressed lesion in the second part of the duodenum. C, The lesion was immersed in gelatinous liquid to secure a favorable visual field. D, The resection site showed no residual lesion. E, F, The specimen size was 26 mm × 16 mm, and tumor size was 10 mm × 8 mm.
