Abnormality

Grading

Anatomical regions scored

Global disease extent

Estimated to the nearest 5%

Five levels are assessed :

1. Origin of the great vessels
2. Main carina
3. Pulmonary venous confluence
4. Halfway between levels 3 and 5
5. Immediately above right hemidiaphragm

Extent of reticulation

As proportion of total disease extent

Percent of ground-glass

As proportion of total disease extent

Coarseness of reticulation :

1. Normal
2. Fine intralobular fibrosis
3. Microcystic honeycombing
4. Macrocystic honeycombing

0
1
2
3

Total disease extent corresponds to the mean of the percentage of disease at each level

Also used by Desai et al. [6]; Hoyles et al. [34]; Goh et al. [35].