Eosinophilic gastroenteritis is an uncommon disease characterized by the presence of abnormal gastrointestinal symptoms, eosinophilic infiltration in one or more areas of the gastrointestinal tract, an absence of the indentifiable cause of eosinophilia and the exclusion of eosinophilic involvement in organs other than gut. The etiology is unknown, and the pathogenesis is poorly understood. Clinical presentations depend on the region of gastrointestinal tract involved and the depth of bowel involvement. We experienced a case of eosinophilic gastroenteritis involving entire GI tract with eosinophilic ascites in a 72-year-old female with abdominal distention and pain. The patient was treated with corticosteroid successfully. We report this case with a brief review of the literatures. (Korean J Gastrointest Endosc 2004;29:2226)