Sleeve Gastrectomy (SG) also called Vertical Sleeve Gastrectomy is another type of weight loss surgery that produces weight loss because of limiting how much can be eaten (that is, a restrictive type of bariatric surgery). During this laparoscopic (minimally invasive) surgery, the surgeon removes the bigger bag-like portion of the stomach (the fundus and part of the body of the stomach) amounting to approximately 60-80% of the stomach. The stomach becomes reduced to the shape of a near-tube from the esophagus to the duodenum, and we call it the sleeve. There is actually no sleeve inserted. The term is just descriptive.