Table 1 Fibrotic lung remodeling according to the Ashcroft score [22]
Grade of fibrosis | Histological changes |
|---|---|
0 | Normal lung |
1 | Minimal fibrous thickening of alveolar/bronchial walls |
2 | Intermediary stage between 1 and 3 |
3 | Moderate thickening of walls without obvious damage to the lung architecture |
4 | Intermediary stage between 3 and 5 |
5 | Increased fibrosis with definite damage to lung structure and formation of fibrous bands or small fibrous masses |
6 | Intermediary stage between 5 and 7 |
7 | Severe distortion of structure and large fibrous areas; honeycombing lung is placed in this category |
8 | Total fibrous obliteration of the field |