Hi, so in early 2017 I began having severe lower abdominal pain that would come on out of know where. It was only relieved by me using the restroom and even then I would be hunched over and felt like I was being stabbed. Then in early 2018 I became severe I'll unable to eat or drink almost anything. I dropped over 50lbs in just 2 months. This was the beginning of my journey. I had an ultrasound done that showed inflammation in the Ileum part of my intestines. Then came a colonoscopy, capsule endoscopy and an upper endoscopy. The Colonoscopy again showed inflammation. When not in a flare up it showed nothing on the capsule endoscopy. Then by the time I had the Upper Endoscopy I was in a flare up and again there was inflammation. Then came multiple stool studies which would go up and down on Inflammation. I am not sure on how a CT will work but I do know it is best to try and have any type of study or testing done while in an inflammation or your results may show nothing. I was diagnosed with Crohns Disease and then it took until 2022 before they finally diagnosed my AS after living with unbearable back, bottom, hip and leg pain. Though I also suffer from Peripheral Neuropathy and Idiopathic Small Fiber Sensory Neuropathy so it affects my hands legs and feet. I hope you can find out what is going on with you as I know abdominal pain can be the worst. Best wishes