It is possible to return if you dont have a AI or PCT but. I had both my glands removed, the doc said they remove everything they can possibly see, but there is a small chance that if there is a tiny particle of the gland left, it can be stimulated which can cause it to re-occur but it is very unlikely. With a good AI and pct you shouldnt have any dramas.
So weather you had the gland removed or not make sure you have your PCT and AI in check. Obviously your less likely to have dramas if the gland was removed.