A case of eosinophilic gastroenteritis is reported in a 17-year-old woman. The disease has the signs of delayed gastric emptying, vomiting, weight loss, and substantial thickening of the gastric antrum. Histopathology established the diagnosis of eosinophilic gastroenteritis of panmural type. Improvement in the patient's symptoms and laboratory parameters was observed with steroid treatment. The clinicopathological features of this disease are summarized in the discussion.