A case of lung fibrosis is presented in a 44 year old male in whom interstitial pulmonary changes were observed in the course of bleomycin therapy of malignant granulomatosis. Following introduction of corticosteroids a radiological, clinical and functional improvement was observed. The functional changes were analyzed during the 7 month period of treatment. This case suggests that post bleomycin induced injury can be reversed with appropriate high doses of corticosteroids.
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