Clinical features and prognosis
This condition is asymptomatic and there is no significant affect on pulmonary function.
The significance of the condition is that there is a risk of development of progressive massive fibrosis.
The risk is highest with category 3 disease - about 30% - and less so with category 2 disease - about 7%.
There is virtually no chance of development of progressive massive fibrosis directly from category 1 disease.
Any disability claim usually requires the presence of at least category 2 disease before a claim can be made.
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