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| | eMedicine - Extrinsic Allergic Alveolitis : Article Excerpt by: Ali Nawaz Khan, MBBS, FRCP, FRCR |
 | | Background: Extrinsic allergic alveolitis, or hypersensitivity pneumonitis, was first described in Iceland in 1874. |
 | | The term heykatarr has been defined as "a group of related inflammatory interstitial lung diseases that result from hypersensitivity immune reactions to the repeated inhalation or ingestion of various antigens derived from fungal, bacterial, animal protein, or reactive chemical sources" (Kaltreider, 1993). |
 | | Pathophysiology: Extrinsic allergic alveolitis is the result of hypersensitivity immune reactions to the repeated inhalation or ingestion of various antigens (see the Table below). |
| www.emedicine.com /radio/byname/extrinsic-allergic-alveolitis.htm (457 words) |
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