Grading
The International Labour Office categorises this condition based on the size of the shadowing produced by these masses on chest radiograph.
A : diameter of opacities greater than 1 cm but less than 5 cm
B : opacities with diameter greater than 5 cm but occupying less than a third of right lung field area
C : opacities with diameter greater than 5 cm and occupying more than a third of right lung field area
Reference
- International Labour Office. Guidelines for the use of the ILO international classification of radiographs of pneumoconioses, revised edition. 2022 [internet publication].
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