Figure 2
From: Endoscopic resection of duodenal bulb neuroendocrine tumor larger than 10 mm in diameter
Endosonographic findings of the duodenal neuroendocrine tumors. A, B, C, D. Well-defined hypoechoic tumor confined to submucosal hyperechoic layer and the intact underlying hyperechoic muscularis propria (A: patient 1; B: patient 2; C: patient 3; D: patient 4).
