Eosinophilic gastroenteritis: a review.

Eosinophilic gastroenteritis is a rare benign disease characterized by tissue eosinophilic infiltration that may involve several digestive tract layers. Also known as allergic, or eosinophilic allergic, gastroenteropathy, it usually involves the stomach and small intestine: rarely the colon. It may or may not be accompanied by higher counts of eosinophils in the peripheral blood. The main clinical manifestations depend on the site affected. It has been classified according to clinical and pathological features, and the symptoms depend on the patient's immunological response to several cytokines released by eosinophils. Because of lack of understanding of the etiology and triggering factors, treatment is based mainly on corticosteroids; although other drugs acting on the immune system have been tested, the results are not always satisfactory. This review focuses on the epidemiology, pathophysiology, clinical features, and treatment of this hitherto under-diagnosed disease.