A 46-year-old man was admitted to our hospital with a 2.5-cm submucosal tumor in the duodenal bulb (Fig. 1). Enhanced computed tomography revealed a rounded abnormal enhancement in the duodenal bulb (Fig. 2). Endoscopic ultrasound showed a heterogeneous hypoechoic lesion originating from the muscularis propria with both intraluminal and extraluminal growth (Fig. 3). A submucosal injection was performed, followed by a mucosal incision around the intraluminal component of the tumor to expose the pseudocapsule.
Qi et al. (Fri,) studied this question.