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. 2018 Mar 2;13:761–769. doi: 10.2147/COPD.S139776

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© 2018 Kawamatawong et al. This work is published and licensed by Dove Medical Press Limited

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Axial CT images with a lung-window setting showing tubular bronchiectasis with the signet ring sign in the right lower lobe (A–C) and the tram-track sign in the left lower lobe (B).

Abbreviation: CT, computed tomography.