|
0
|
Normal lung
|
|
1
|
Minimal fibrous thickening of alveolar or bronchiolar walls with a few of inflammatory cells
|
|
2
|
Between 1 and 3
|
|
3
|
Moderate thickening of walls without obvious damage to lung architecture
|
|
4
|
Between 3 and 5
|
|
5
|
Increased fibrosis with definite damage to lung structure and formation of fibrous bands or small fibrous masses
|
|
6
|
Between 5 and 7
|
|
7
|
Severe distortion of structure and large fibrous areas; Typical silica nodules formed by collagen fibers.
|
|
8
|
Total fibrous obliteration of the field
|
