[Subacute idiopathic eosinophilic pneumopathy with favorable outcome without corticotherapy].

The authors report a case of acute idiopathic eosinophilic pneumonia, a recently described entity of unknown etiology. The patients develop a rapidly progressive respiratory failure which is reversible following steroid therapy. The key to the diagnosis is an eosinophilia in the broncho-alveolar lavage or in the lung biopsy. Our observation of a favourable outcome in this case without steroid therapy is evidence perhaps of a less aggressive form of the disease.