Fig. 3

Endoscopic views of gastric lesions. A Gastric fibrotic target lesions. B Gastric normal target lesions. Compared with the normal gastric mucosa in the control group (B1-2), the center of injection area in the experimental group observed an ulceration covered with white mucoid cap on PID 7 (A1), with an endoscopic ultrasonography finding of locally interrupted and thickened submucosal layer (A2, red arrow). The submucosal layer showed moderate fibrosis in the experimental group, which appeared as a white web-like structure in the blue submucosal layer (A3), and the control group manifested as a blue transparent layer (B3). The section of resected specimen revealed scar-like tissue in the experimental group (A4), and the control group presented blue transparent submucosal layer with clear vessel (B4)