1 |
One lobe less than 25% of lobe area |
2 |
One lobe more than 25% of lobe area |
3 |
Unilateral and less than one lobe less than 25% of each lobe area |
4 |
Unilateral and more than one lobe less than 25% of each lobe area |
5 |
Bilateral patch lesions on all lobes |
6 |
Bilateral, all of one but not all lobes |
7 |
Bilateral, all lobes, diffuse but less than 25% of each lobe area |
8 |
Bilateral, all lobes, diffuse and 25–50% of each lobe area |
9 |
Bilateral, all lobes, diffuse and 50–75% of each lobe area |
10 |
Bilateral, all lobes, diffuse and more than 75% of each lobe area |