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Table 6 Distribution of diagnoses in the HP Study [4]

From: Hypersensitivity pneumonitis

Diagnosis Number of patients
Hypersensitivity pneumonitis 199
Pigeon breeder's/bird fancier's disease 132
Farmer's lung 38
Humidifier lung 3
Suberosis 2
Summer type HP 2
Various exposures to fungi 19
HP of unknown origin 3
Controls 462
Idiopathic interstitial pneumonia * 226
Sarcoidosis 52
Interstitial disease associated with collagen vascular disease 35
Drug induced pulmonary disease 26
Bronchiolitis obliterans (with our without organizing pneumonia) 25
Unspecified interstitial lung disease † 26
Infectious pneumonia 11
Histiocytosis X 10
Asthma 6
Silicosis 5
Eosinophilic pneumonia 5
Normal lung 4
Bronchoalveolar carcinoma/carcinomatous lymphangitis 4
Residual HP ‡ 3
Residual HP ‡ 3
Organic dust toxic syndrome 3
Lymphocytic interstitial pneumonia 2
Pulmonary edema (heart failure) 2
Radiation pneumonitis 2
Miscellaneous § 13
  1. * includes patients with the clinical diagnosis of idiopathic pulmonary fibrosis, and those with the pathological diagnoses of usual, desquamative, respiratory bronchiolitis, acute and non-specific interstitial pneumonia;
  2. † includes patients in whom no specific diagnosis could be reached but in whom HP was excluded on the basis of BAL;
  3. ‡ includes late emphysematous or fibrotic sequelae of HP in which the typical alveolar lymphocytosis of active HP has disappeared;
  4. §includes single cases of alveolar hemorrhage, anthracosis, berylliosis, Churg-Strauss syndrome, diffuse panbronchiolitis, hepato-pulmonary syndrome, HIV-associated nonspecific interstitial pneumonia, necrotizing sarcoid granulomatosis, pulmonary amyloidosis, alveolar proteinosis, crack lung, Pneumocystis carinii pneumonia, and Wegener's granulomatosis.