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acute hypersensitivity pneumonitis
Etiology:
1) Micropolyspora faeni
2) Thermoactinomyces vulgaris
Pathology:
- biopsy may show bronchiolitis obliterans with organizing pneumonia (BOOP)
Clinical manifestations:
1) symptoms appear 4-6 hours after exposure
a) fever/ chills
b) sweats
c) dry cough
d) dyspnea
e) tachypnea
f) basal crackles
g) no wheezing
2) symptoms resulve within 18-24 hours but recur on re-exposure
Laboratory:
1) leukocytosis
2) hypergammaglobulinemia
3) serology: precipitating antibody
4) biopsy is rarely indicated
Radiology:
- chest X-ray
a) increased bronchovascular markings
b) fine reticular & nodular defects
Related
bronchiolitis obliterans; constrictive bronchiolitis; cryptogenic organizing pneumonia; bronchiolitis obliterans with organizing pneumonia (BOOP)
General
hypersensitivity pneumonitis; extrinsic allergic alveolitis; pigeon breeder's lung; bird fancier's lung; farmer's lung; allergic pneumonitis
References
Mayo Internal Medicine Board Review, 1998-99, Prakash UBS (ed)
Lippincott-Raven, Philadelphia, 1998, pg 759-60