Lookup NU author(s): Dr Stephen Bourke,
Professor Jane Calvert,
Professor Christopher Baldwin,
Dr Sylvia Worthy
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• Extrinsic allergic alveolitis (EAA) is an immune disease in which certain antigens provoke granulomatous inflammation in the distal airways and alveoli of susceptible subjects. • Bird breeder's lung, farmer's lung and humidifier lung are the most common clinical EAA syndromes in the UK. • Acute EAA presents as breathlessness, fever and malaise occurring 4 h to 8 h after antigen exposure. Chronic EAA is characterized by chronic breathlessness and lung fibrosis. • EAA is a dynamic and variable condition which remits and recurs in relation to antigen exposure. Chest radiographs may be normal between episodes, but typically show subtle diffuse lung infiltrates during acute disease. • High resolution CT in EAA typically shows areas of ground-glags opacification and areas of reduced attenuation in subacute disease. Interstitial fibrosis and emphysema are features of chronic EAA. © 2003 The British Institute of Radiology.
Author(s): Bourke SJ, Calvert JE, Baldwin CI, Worthy S
Publication type: Article
Publication status: Published
Print publication date: 01/01/2003
ISSN (print): 0965-6812
ISSN (electronic): 1748-8818
Publisher: British Institute of Radiology