Interesting finding

I have a patient, 49, he had appenticitis about ten years ago associated with peritonitis. He is left with a scar - a bit higher than expected for appendicitis and a bit larger. A small part of the scar opened up again a few days after the intervention and then got closed again.
The interesting thing is that as the day goes on, he seems to be getting a painless incisional hernia that he can push back in. As we push it back in we can also hear a boborygmi-like noise - indicating that it is gut, I think.
I think what's happened is that the surgeon joined the skin and muscle (I hope!) but not the peritonium. I've refered him to his GP for a second opinion so we'll see...