Four cases of eosinophilic (allergic) gastroenteritis are reported, including the first 2 reports of involvement limited to the small bowel. The roentgenologist's role in the diagnosis of eosinophilic gastroenteritis is important. This condition should be considered in patients with peripheral eosinophilia and with the described roentgenologic changes in the stomach and small bowel. An allergic reaction of the gastrointestinal surfaces is considered a likely explanation for eosinophilic gastroenteritis.