645609.fig.001a
(a)
645609.fig.001b
(b)
Figure 1: (a) Endoscopic appearance revealed a 20-mm diameter submucosal tumor with a smooth surface in the third portion of the duodenum. (b) Preoperative endoscopic ultrasonography (12 MHz miniature probe). Arrowheads indicate that muscle layer was preserved beneath the tumor without an extramural component.