Extrinsic allergic alveolitis


Tengku Ismail, Faculty of Medicine, Level 20, Complex S&T, Universiti Teknologi MARA, 40450 Shah Alam, Selangor Darul Ehsan, Malaysia. Email: tengkusaifudin@yahoo.co.uk


Abstract:  Extrinsic allergic alveolitis (also known as hypersensitivity pneumonitis) is caused by repeated inhalation of mainly organic antigens by sensitized subjects. This induces a hypersensitivity response in the distal bronchioles and alveoli and subjects may present clinically with a variety of symptoms. The aims of this review are to describe the current concepts of the immunological response, the diverse clinical presentation of this disease, the relevant investigations and management, and areas for future studies.