Radiographic imaging patterns of organising pneumonia
| Consolidation |
| Subpleural and/or peribronchial |
| Mid to lower lung zone predominance |
| Can be perilobular |
| Opacities may migrate, wax, wane or disappear |
| Spontaneous regression of consolidated areas may occur |
| Combination of bilateral subpleural consolidation and mid to lower zone predominance observed in majority of patients |
| Other patterns |
| Focal with single nodule or mass |
| Nodular (variable size, can be solitary or multiple) |
| Reversed halo sign (ground-glass opacity, surrounded by a crescent or ring of consolidated parenchyma) |
| Ground-glass opacities (usually bilateral, patchy, seen in up to 90% of patients with cryptic organising pneumonia) |
| Parenchymal bands (often associated with multifocal consolidations) |
| Perilobular (arcade-like or polygonal opacities that are poorly defined and border secondary pulmonary lobules) |
| Fibrotic |
| Reticular opacities with basilar predominance, architectural distortion and superimposed alveolar opacities |
| Honeycomb change, traction bronchiectasis |
| Rare changes |
| Diffuse micronodules (centrilobular or peribronchial) |
| Mediastinal lymph node enlargement |
| Pleural effusion |