Modified side overlap esophagogastrostomy after laparoscopic proximal gastrectomy.

We report a new method of esophagogastrostomy after proximal gastrectomy, side overlap with fundoplication by Yamashita (SOFY) in 2017. Recently, even better treatment results can be obtained by modifying the SOFY method. We describe the technical details of the modified SOFY (mSOFY) after laparoscopic proximal gastrectomy. The stomach was dissected in the short axis direction and the esophagus was dissected in the left and right direction. After the proximal gastrectomy, the bilateral diaphragmatic crus were dissected to enhance gastric elevation. After confirming that the esophagus overlapped more than 5 cm at the center of the remnant stomach (we call it SOFY check), the remnant stomach was suture-fixed to the dissected diaphragmatic crus. The right wall of the esophageal stump and the remnant stomach were anastomosed using the full length of a 45 mm-linear stapler. The entry hole was closed in a direction that did not widen the anastomotic hole. Both sides of the esophagus, remnant stomach, and diaphragmatic crus were suture-fixed on the cranial side 1-2 cm away from the anastomosis. Moreover, the left wall and lower end of the esophagus was suture-fixed to the remnant stomach. The preserved dorsal esophageal wall is pressed and flattened by pressure from the pseudofornix, which is the reflux prevention mechanism. The mSOFY method had favorable treatment outcomes. In conclusion, mSOFY can be one of the safe and feasible reconstruction methods after laparoscopic proximal gastrectomy.