[Chronic idiopathic eosinophilic pneumopathies. A study of 16 cases].

We report 16 cases of chronic idiopathic interstitial pneumonia (P.C.I.E.). P.C.I.E. has well defined clinical, radiological and biological characteristics which enable the eosinophilic pulmonary infiltrates to be recognised and the diagnosis to be confirmed without histological proof. The data from broncho-alveolar lavage (L.B.A.) show that besides the radiological infiltrates, there is a diffuse alveolar eosinophilia; sometimes confirming the pulmonary function results, which show a similar pattern to diffuse interstitial pneumonia (P.I.D.). The frequent association of asthma (50%) and extra-pulmonary signs (30%) may suggest a vasculitis or more particularly the Churg-Strauss syndrome, all the more so without a lung biopsy; however the evolution of the disease and the response to low dose steroid therapy is against the latter two being considered in the differential diagnosis. The prognosis for P.C.I.E. is good in the short and medium term; nevertheless during the period under observation (mean 6.3 years) steroid therapy could only be stopped in 3 out of 16 patients. The other patients were stable with a low dose of Cortisone. No patient with P.C.I.E. associated with asthma or hypergammaglobulinaemia or extra-pulmonary signs could be weaned from steroids. The authors advocate that the dose of steroids should be adjusted as low as possible to maintain an eosinophilia below 500/mm3.