Submucosal protuberance caused by a fish bone in the absence of preoperative positive signs: A case report

Figure 1 Preoperative imaging examinations. A: Gastroscopy revealing a submucosal protuberance of the gastric antrum; B: Endoscopic ultrasonography indicating a round mixed echogenic mass with a size of approximately 1.19 cm × 0.89 cm; C: Abdominal computed tomography scan showing no obvious abnormal thickening or enhancement shadow of the gastric antrum.