In RA, pleural involvement is very common at autopsy but infrequently causes symptoms. Interstitial lung disease (ILD) is the most common manifestation of rheumatoid lung disease. RA associated interstitial lung disease (RA-ILD) is usually similar to idiopathic pulmonary fibrosis (IPF) in terms of its clinical presentation, pathology, disease spectrum, and pathogenesis. Presentation is more common at age 50-60 years, in men (M:F=2-3:1), and in association with seropositive and erosive joint disease. If pleural fluid is present, glucose levels are very low.