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. 2021 Jun 18;9(5):539–545. doi: 10.1007/s40336-021-00441-0

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — B-Mode (A) and color-Doppler (B) US examination performed in a 28-year-old woman 2 days after receiving the second dose of vaccine: axillary lymph nodes (maximum diameter 14 × 9 mm) with fatty hilum but diffuse cortical thickening (maximum 10 mm, arrows in A) and vivid hilar and cortical vascularization (B) were detected. B-Mode (C) and color-Doppler (D) US examination performed after 4 weeks: reduction of lymph nodes size (7 × 6 mm), cortical thickness (2.9 mm) and vascularization was observed