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55-year-old woman with known rheumatoid arthritis complaining of exertional dyspnea, chronic cough and obstructive pattern at respiratory tests. On coronally-reformatted inspiratory CT image no lung abnormalities can be seen (a). Coronally-reformatted expiratory CT image shows extensive air-trapping (b). Note presence of subchondral cysts (arrows) and narrowing of gleno-humeral joint spaces.
