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The most common three patterns in RA-ILD. The representative images of chest high-resolution CT with (a) UIP, (b) NSIP, and (c) OP patterns are shown. (a) Bilateral subpleural and basal reticular opacities (↑) with honeycomb (*) are typical of a UIP pattern. (b) Subpleural patchy parenchymal opacities (√) with underlying fibrosis and traction (↖) in both lungs. (c) Subpleural consolidations (↗).
