| Clinical features |
| Preserved pulmonary function with decreased gas transfer |
| HRCT features |
| Emphysema |
| Centrilobular nodules |
| Cysts in areas of ground-glass opacity |
| Histopathological features |
| Emphysema |
| Emphysema-like airspace enlargement with fibrosis |
| Respiratory bronchiolitis |
| DIP-like foci |
| Bronchiolocentric stellate scars (± smooth muscle) (simulating healed PLCH) |
HRCT: high-resolution computed tomography; DIP: desquamative interstitial pneumonia; PLCH: pulmonary Langerhans’ cell histiocytosis.