[Pneumonitis in elderly patient with ANCA-positive glomerulonephritis during treatment with cyclophosphamide].

A 78 year-old woman with extracapillary glomerulonephritis was treated with cyclophosphamide and corticosteroids. Three months after starting the therapy, the patient had an episode with breathlessness, cough and sputum without fever. X-ray showed bilateral interstitial infiltrates. She was initially treated with empirical antibiotics without achieving clinical or radiological changes. After ruling out an infectious cause, activity of the underlying disease, and other causes of fibrosis, treatment with cyclophosphamide was stopped. Following this, there was an immediate improvement of her clinical and radiological states. The administration of cyclophosphamide was considered directly related to the cause of her symptoms.