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. 2018 Dec 17;8:17897. doi: 10.1038/s41598-018-36115-7

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Analysis of branches of the pulmonary artery in a patient with APE. (A) The projection of branches of the pulmonary artery on coronal plane. (B) Holistic view of branches of the pulmonary artery. (C) Branches of the right pulmonary artery. (D) Branches of the left pulmonary artery. (E) Instruction of “n” and “d” in calculation formula of PAOI. U, up; L, left; P, posterior; PT, pulmonary trunk; RPA, right pulmonary artery; LPA, left pulmonary artery. A1, apical segmental artery; A2, posterior segmental artery; A3, anterior segmental artery; A4, lateral segmental artery (right side) or superior lingual segmental artery (left side); A5, medial segmental artery (right side) or inferior lingual segmental artery (left side); A6, superior segmental artery; A7, medial basilar segmental artery; A8, anterior basilar segmental artery; A9, lateral basilar segmental artery; A10, posterior basilar segmental artery.