Well, for one thing, your ileal pouch (and your rectum, when it existed) would lay next to the spine, behind your bladder, and not insubstantial abdominal wall. It is deep in the pelvic cavity, under the bones of the pelvic girdle. So, unless you have x-ray vision, you are seeing something other than your ileal pouch. I am not saying you do not have a s-pouch, just that you cannot know without looking at your records or asking your surgeon.
The reason they do not do s-pouch procedures much anymore is because the design makes for an "extension" of ileum beyond the pouch to connect to the anus. This makes a pouch procedure possible where there just isn't enough anotomic reach for the mesenteric blood supply. However, without the musculature of a rectum, this extension sometimes twists or collapses during the pressure of emptying, closing off the exit. Only surgical repair can fix it. If you had this emptying problem, it would not come and go (I get the same thing and it is related to local inflammation or not chewing well enough). It would be all the time and progressively worsening over time.
Jan 