“…[9][10][11][12] The most invasive endoscopic techniques include endoscopic mucosal resection (EMR) EMR and endoscopic submucosal dissection (ESD). [13][14][15] Sporadic nonampullary duodenal adenomas are rare, and the optimal treatment strategy has not yet been defined. Spontaneous duodenal adenomas are considered precancerous lesions with a high rate of malignant transformation.…”