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. 2019 Dec 4;10:114. doi: 10.1186/s13244-019-0789-4

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© The Author(s). 2019

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.

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Fig. 33 — Tree-in bud sign. Small centrilobular nodularities and linear ramifications (white arrows in a and b) may be appreciated in the right lower lobe of a patient with cough and fever; these CT findings—which show the typical appearance of tree-in-bud—are related to the presence of inflammatory bronchiolitis. This tree-in-bud appearance is a morphological pattern that resembles a flowering tree (c)