Cough is known to be the major respiratory side effect of treatment with angiotensin converting enzyme inhibitors (ACEI). Recently, ACEI have been implicated in drug-induced lung disease. We report a new case of diffuse pneumonitis which occurred during treatment with ACEI. A 73-year-old man was admitted for cough, dyspnea at rest, fever and weight loss. The patient had been treated with the ACEI pirindopril during 6 months for systemic hypertension. Chest radiographs showed reticular infiltrates in the upper lung fields. A CT scan confirmed the infiltrates and showed pleural thickening and airspace opacities. White blood cell counts showed 15,700/mm3 leucocytes with 940 eosinophils/mm3. Transbronchial biopsy was consistent with infiltration of the lung with eosinophils. There was no evidence for another etiology. Once the drug was withdrawn, clinical and radiological abnormalities improved but steroids were required to control symptoms. This report suggests that pirindopril, as captopril, can induce the picture of drug-induced pulmonary disease.