HardRheumatologyRheumatoid Arthritis / Interstitial Lung Diseasemrcp part 1ukmla
A 58-year-old woman with rheumatoid arthritis, well-controlled on methotrexate 15mg weekly and folic acid 5mg weekly, complains of increasing shortness of breath and a dry cough over the past 3 months. A chest X-ray shows bilateral interstitial infiltrates. Pulmonary function tests show a restrictive pattern with reduced diffusion capacity (DLCO). What is the most likely cause of her respiratory symptoms?