Very good question. Twenty-three years after treatment I certainly hope it has gone away. The thought of going through the years of treatment and repairs again is frightful. Alas, I think it can return in some although we usually hear of return within the first year or so. Some I understand have had reoccurrence eight or ten years later, but a minority of patients they are. I prefer the bliss of believing once and done. Maybe someone knows the statistics on this. For me, the answer is it goes away.