| NRAD | fBOS |
Airway inflammation | Neutrophils | No neutrophils |
Clinical picture | Crackles, increased sputum production | No crackles, little sputum |
Time after transplantation | Early | Late |
Course | Slowly, several years | Fast, 6 months |
Histology | Initially inflammation, finally fibrosis | Merely fibrotic |
AZI therapy | Beneficial/reversible | Not beneficial/irreversible |