answer:A CT Scan can be done with or without contrast and may be able to show a tear or fistula. They can also be done with dye in the blood stream to look for bleeding (like an angiogram) in the GI tract. An MRI can be done to get a better picture of what was seen on a CT Scan, but may not notice a small tear. The best way to look for a tear or fistula would be with endoscopy.