| Fibrosis score(F score) | Emphysema score (E score) |
---|---|---|
0 | No fibrosis | No low attenuation areas (LAAs) |
1 | Interlobular septal thickening; no discrete honeycombing | Sparse, scattered small LAAs up to 5 mm in diameter |
2 | Honeycombing (with or without septal thickening) involving < 25% of the lobe | Adjacent LAAs up to 10 mm in diameter |
3 | Honeycombing (with or without septal thickening) involving 25–49% of the lobe | LAAs > 10 mm that were adjacent to or indispensable from each other |
4 | Honeycombing (with or without septal thickening) involving 50–75% of the lobe | Absence of normal lung parenchyma |
5 | Honeycombing (with or without septal thickening) involving > 75% of the lobe | NA |