Table 3.
Comparison of histopathological findings for each MDD diagnosis.
| Histopathological Findings | Fibrotic HP (n = 12) |
Non-Fibrotic HP (n = 2) |
Non-HP (n = 4) |
|---|---|---|---|
| Fibrosis | 11 (92%) | 0 (0%) | 4 (100%) |
| Chronic fibrosing IP | 11 | 0 | 4 |
| Airway disease | 5 (42%) | 2 (100%) | 4 (100%) |
| Airway-centered distribution | 4 | 2 | 3 |
| Airway-centered fibrosis | 3 | 0 | 3 |
| Peribronchiolar metaplasia | 5 | 0 | 4 |
| Bronchiolitis | 4 | 2 | 1 |
| Bridging fibrosis | 1 | 0 | 0 |
| Poorly formed granuloma | 4 | 1 | 0 |
| Inflammation | 11 (92%) | 2 (100%) | 4 (100%) |
| Cellular IP | 10 | 2 | 4 |
| Organizing pneumonia | 4 | 1 | 2 |
| Cellular bronchiolitis | 2 | 1 | 1 |
| Foamy macrophages | 3 | 2 | 0 |
| Giant cells with cholesterol clefts | 2 | 0 | 0 |
| Poorly formed granuloma | 4 | 1 | 0 |
| Pathology pattern in GL [4] | |||
| HP | 2 | 1 | 0 |
| Probable HP | 2 | 0 | 3 |
| Indeterminate for HP | 8 | 1 | 1 |
GL, guideline; HP, hypersensitivity pneumonitis; IP, interstitial pneumonia.