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. 2020 Jan 8;21:10. doi: 10.1186/s12931-020-1273-x

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© The Author(s). 2020

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Typical computed tomography (CT) findings for Mycobacterium avium complex pulmonary disease patients in this study. a, b A patient in the progressive cavity group. The follow-up period was 4.2 years. A) Initial CT scan (section thickness, 1 mm) showed cavity formation (maximum inner diameter, 22 mm) with consolidation (arrowhead), a small nodule, a nodule (dashed arrow), and bronchiectasis (arrow) in the right upper lobe. b Follow-up CT scan (section thickness, 1 mm) at a similar level showed extension of the cavity and emergence of new cavities. c, d A patient in the non-progressive cavity group. The follow-up period was 3 years. c Initial CT scan (section thickness, 1 mm) showed cavity formation (maximum inner diameter, 14 mm) with bronchiectasis (arrow) in the right upper lobe. d Follow-up CT scan (section thickness, 1 mm) at a similar level showed cavity formation (maximum inner diameter, 21 mm). All images show lung tissue (window width, 1500 Hounsfield units (HU); window level, − 600 HU)