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A) Twin 1 on biologic therapy. Central bronchiectasis are seen without mucus impaction and without parenchymal abnormalities. B) Twin 2 not on biologic therapy. Lung windows (left) reveal central cylindrical bronchiectasis, mucus impaction, and tree-in-bud nodularity. Mediastinal windows (right) show high attenuation mucus with Hounsfield units > 70 (red arrows).
