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Pre-Surgery Diagnosis Needed?
The area and symptoms may be due to a Spigelian or interstitial inguinal hernia. Hard to believe it was missed on CT but it’s been known to happen. A Valsalva image (CT or MRI) helps view small hernias best.
You can have your images re-read by a local radiologist as a consult or I am happy to review them. Ileostomy seems extreme for your problem and based on your GI workup is low likely to resolve your symptoms. Upon laparoscopy, the peritoneum needs to be taken down to be completely sure there is no hernia. I assume that was not done with your last laparoscopy. And during loop ileostomy depending on the technique they may not do anything more than a right lower quadrant incision.