[Follicular bronchiolitis: an infrequent cause of interstitial pneumopathy].

A 63-year-old woman with follicular bronchiolitis presenting as diffuse interstitial pneumopathy is described. Diagnosis was made by open lung biopsy and the patient was treated in our department until death. The course of disease and response to treatment was similar to that observed in cases of idiopathic pulmonary fibrosis. No associated collagen disease was found. This report reviews the histological and clinical signs of this disease, as well as treatment.