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.

Figure 2 Surgical images. A: During the endoscopic submucosal dissection, a white strip of a foreign body was found under the wound; B: A fish bone approximately 20 mm in length was removed using a dual knife.

Figure 3 Computed tomography reconstruction of a fishbone-like (approximately 20 mm long) high-density image.