Endoscopic trans-esophageal submucosal tunneling surgery: A new therapeutic approach for diseases located around the aorta ventralis

Figure 4 Surgery of retroperitoneal tissue resection. A: The aorta ventralis was observed in the endoscopic direct status; B: The retroperitoneal space was visible near the aorta ventralis; C and D: Partial resection of tissues in the retroperitoneal space using an electric knife; E and F: Partial resection of the omentum majus using an endoloop; G: Omentum majus tissue stained with hematoxylin and eosin (200 ×); H: A large amount of liquid and chyme in the abdominal cavity.