If I had a surgeon that removed less than all of the fundus from my stomach (approx 85% of the total stomach) I think he would be hearing from the state medical board. The whole point of this surgery is to creat a smaller, more restrictive stomach. Leaving fundus behind means that you could easily stretch your stomach back to its old dimensions. This is one of the major problems I have with RNY, the pouch is made from fundus, it starts about 2oz, but many people stretch it way out to he point they don't have restriction anymore. The sleeve once folly healed is about 8-10oz, that is plenty, many people are actually surprised at how much they can eat once all the swelling is gone.