SUMMARY 1.Six cases of proved eosinophilic granuloma of the lungs are reported, including follow-ups of eight years and six years on two of them. Twenty-three additional cases from the literature are reviewed. 2.Pulmonary function studies showed the only consistent abnormality to be overdistention of the lungs. Lung compliance was reduced at some time during the course of the disease in three of four patients. Definite restrictive changes were demonstrated in one during the early stages of his disease. 3.Lack of rsponse to specific regimen of therapy in pulmonary eosinophilic granuloma is noted. Patients should be given the opportunity to undergo spontaneous remission.