The unusual features in a 46 year old white woman with mucosal eosinophilic gastroenteritis are described. In addition to involvement of the gastrointestinal tract, she had eosinophilic splenitis and hepatitis. She responded to corticosteroid therapy, but not to an elimination diet or to cromolyn sodium therapy. The possible role of various factors chemotactic for eosinophilia in the patient are reviewed, and the place of the disorder among the hypereosinophilic syndromes is discussed. © 1977.