It is probably like how we call all tissues "Kleenex". The pouch and the sleeve result from different surgical procedures, but it's all bariatric surgery. The sleeve is more like a tube. Oh well, it is another one of those debates that won't stop the world from turning.
Maybe, as a friend's Irish aunt would have said, "They have little to do." On the other hand, we all don't necessarily know. To me, "pouch" is from the lapband lexicon.
