In a patient with occupational coal mine dust exposure, how do you interpret the presence of non-necrotizing granulomas in a lung biopsy specimen with respect to a possible diagnosis of coal workers’ pneumoconiosis (CWP)? Does this finding favor CWP, make it less likely, or is it nonspecific?

The finding of non-necrotizing granulomas is atypical of the histology of coal workers' pneumoconiosis (CWP) and could be indicative of co-incident sarcoidosis, especially if there are other features of sarcoidosis, such as bilateral hilar adenopathy, etc. It could also be a manifestation of a co-ex...