I had my pouch excised and permanent ileostomy created on December 15th. Since then I have had recurring UTI's despite antibiotics. A CT scan last week revealed air in my bladder, and I also continue to pass air when I urinate. My surgeon said it could just be due to having a catheter after my surgery (was removed on 12/20). However, this has continued for 3 weeks. With my symptoms and CT findings, could this be a bladder fistula? Is it possible that this was created during my surgery, by the surgeon nicking my bladder/intestine? My surgeon keeps brushing it off, saying that he didn't see a fistula when operating. Should I press him for further testing/investigating? If it is a bladder fistula what is the treatment?