HRCT findings commonly encountered in patients with idiopathic interstitial pneumonias (IIPs)*
| IIP | Distribution | Predominant HRCT findings |
|---|---|---|
| HRCT, high resolution CT; IIP, idiopathic interstitial pneumonia; UIP, usual interstitial pneumonia; NSIP, non-specific interstitial pneumonia; AIP, acute interstitial pneumonia; RB-ILD, respiratory bronchiolitis-interstitial lung disease; DIP, desquamative interstitial pneumonia; COP, cryptogenic organising pneumonia; LIP, lymphocytic interstitial pneumonia | ||
| *The predominant findings may vary somewhat depending on the phase of the disease. | ||
| UIP | Basilar, subpleural | Reticulation (usually coarse) |
| Architectural distortion | ||
| Traction bronchiectasis | ||
| Honeycombing | ||
| NSIP | Basilar, subpleural | Ground glass opacity |
| Reticulation (usually fine) | ||
| Architectural distortion | ||
| Traction bronchiectasis | ||
| Consolidation | ||
| AIP | Diffuse | Ground glass opacity |
| Consolidation | ||
| RB-ILD | Multifocal | Ground glass opacity |
| Airway thickening | ||
| Air trapping | ||
| Ground glass centrilobular nodules | ||
| DIP | Multifocal, often peripheral | Ground glass opacity |
| Reticulation | ||
| COP | Subpleural, peribronchiolar | Consolidation |
| Ground glass opacity | ||
| LIP | No predominance | Ground glass opacity |
| Peribronchiolar nodules | ||
| Centrilobular nodules | ||
| Linear opacities | ||
| Cysts | ||