Cavitating BOOP associated with myeloperoxidase deficiency in a floor cleaner with an incidental heavy exposure to benzalkonium compounds.

Bronchiolitis Obliterans Organizing Pneumonia (BOOP) is an inflammatory lung disease simultaneously involving the terminal bronchioles and alveoli. BOOP is defined idiopathic in most patients, but it can also be secondary to several known causes (drugs, infections, organ transplantation, radiotherapy) or associated to tumours and haematologic malignancies, rheumatologic and connective tissue diseases, immunodeficiency syndromes, inflammatory bowel diseases and other systemic disorders. Rarely BOOP has been reported as related to occupational or environmental agents exposure. We describe a lady developing BOOP two weeks after she inhaled vapours of benzalkonium compounds, components of a cleaning agent a lot which was spilled on the floor.