stricture?
If I am not mistaken, and please someone correct me if I am, it is a narrowing of the opening where the pouch empties into the intestine.
I believe that it can happen by food getting stuck, or by scar tissue healing over part or all of the opening.
It does happen sometimes and they usually just us a special scope and "stretch" the opening back up.
Some signs of a possible stricture could be
Can't keep solid food down at all
Can only eat liquid like soup or broth,
Not feeling well in general
Hugs
Diane