Abstract
Rheumatoid arthritis is a systemic inflammatory disorder with diverse extra-articular manifestations including vasculitis, lung disease, inflammatory eye disease and subcutaneous nodule formation. Among these manifestations, lung disease has been identified as a primary contributor of morbidity and mortality. The predominance of non-specific interstitial pneumonia pattern has been observed in most forms of connective tissue-associated ILD. Studies have demonstrated that the usual interstitial pneumonia (UIP) pattern is more prevalent among patients with RA-associated ILD. The extra-articular manifestations have been noted in nearly 50% of the patients, and the lung involvement in majority of the cases.8, 9 This study details the occurrence of lung involvement of viral etiology in RA, which could be misdiagnosed as RA-associated ILD.
Highlights
Rheumatoid arthritis is a systemic inflammatory disorder with diverse extra-articular manifestations including vasculitis, lung disease, inflammatory eye disease and subcutaneous nodule formation
This study details the occurrence of lung involvement of viral etiology in RA, which could be misdiagnosed as RA-associated interstitial lung disease (ILD)
The diagnosis was concluded as interstitial pneumonia due to H1N1
Summary
ILD is a frequently noted extraarticular manifestation of RA. The predominance of non-specific interstitial pneumonia pattern has been observed in most forms of connective tissue-associated ILD. Studies have demonstrated that the usual interstitial pneumonia (UIP) pattern is more prevalent among patients with RAassociated ILD.[1] Conventional DMARDs and biological agents may induce or worsen ILD in RA patients. Infections may increase the risk of mortality in such patients.[2]. During the global flu epidemic 2009-10, several swine flu pneumonia cases were reported from various parts of the world. The commonly noted histopathologic changes observed in this type of pneumonia include focal squamous
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