Radiographic imaging patterns of organising pneumonia

 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)
 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