What if the problem is in the small intestine?
The endoscope can be passed through the valve at the lower end of the stomach (pylorus) and into a short segment of the small intestine (duodenum) in some cats. This depends on the size of the cat and the size of the endoscope. However, the vast majority of the small intestine is not accessible to endoscopy. Most diseases of the small intestine require other tests to be diagnosed.