Does pouchitis show up on a cat scan?
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You can't see pouchitis on a CAT scan. It's generally diagnosed by pouchoscopy or by symptoms.
If there is enough inflammation, it may show up on a CT scan, but they never would do one just to look for it, just based on the radiation exposure alone. Plus, you can't do biopsies with a CT scan. Scans are better for looking for problems you can't find on a scope.
Jan 
Thank you. Ive been in the hospital for a few days now and thats all they done so far is a CT scan. Just in a lot of pain and have frequent urges with very little stool passing
Oh, OK. Sounds like an obstruction or maybe paralytic ileus (The gut just stops moving). If you had a twisted gut or other complete obstruction, that would show on the CT. They don't like to scope if they think you might have a surgical abdomen.
Jan
I have had a CT Enterography and an MRI Enterography, and on both exams inflammation causing a stricture at the J Pouch inlet was visible. The MRI Enterography is the better of the two exams for diagnostics, from what I was told. It's a much longer procedure, however, when including the interval times of all the contrast plus the different sequences on imaging as they wait for the contrast to pass through the bowel. My MRIE was close to 3 hours long from when I got to the facility to when I left.