Eosinophil infiltration of the stomach or gastro-intestinal tract is an unusual condition, in which an inflammatory infiltrative condition may present as a tumorous mass simulating a malignant growth. Although the condition was first described in 1937 and a number of cases have since been reported, not a great deal is known about it. Its aetiology is obscure and its behaviour variable. Patients in whom the disease is likely to spread widely through the stomach and small intestine, and where it is likely to recur and progress, may have eosinophilia.S. Afr. Med. J. 48, 405 (1974).