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Grading

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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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

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