Application of endoscopic submucosal dissection in duodenal space-occupying lesions

Figure 2 Endoscopic submucosal dissection was performed for a depressed lesion in the descending duodenum. A flat polypoid elevation approximately 15 mm in diameter with central depression was observed in the duodenal bulb, hybrid endoscopic submucosal dissection was performed, and pathology suggested a tubular adenoma. A: A depressed lesion in the descending duodenum; B: NBI showed that the lesion boundary was clear; C: Mark the lesion boundary; D: The mucosa layer was incised circumferentiality; E: Dissect the lesions along the submucosa; F: Muscular perforation; G: Cover the perforation with nylon rope and metal clips; H: Resected specimen for pathological examination.