Pulmonary fibrosis after prolonged treatment with low-dose cyclophosphamide. A case report.

Interstitial pulmonary fibrosis is described in a 26-year-old woman with malignant lymphoma after prolonged intake of cyclophosphamide. Cyclophosphamide was given over a period of 13 years in an oral daily dose of 50-100 mg. Lung biopsy revealed extensive fibrosis with no evidence of malignancy or infection. Cyclophosphamide is considered the most likely cause of pulmonary fibrosis in this patient.