Rheumatoid arthritis-related interstitial lung disease: associations, prognostic factors and physiological and radiological characteristics--a large multicentre UK study.

Objectives: The prevalence of interstitial lung disease (ILD) in RA is ∼5%. Previous work identified increasing age, active articular disease and articular damage as risk factors for RA-associated ILD (RA-ILD). The roles of high-resolution CT (HRCT) and lung function testing in defining the nature and extent of pulmonary involvement have recently been explored.

How common is methotrexate pneumonitis? A large prospective study investigates.

The current literature states the prevalence of methotrexate pneumonitis (MTX-P) to be 3.5-7.6%.