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. 2019 Apr 4;19:28. doi: 10.1186/s12880-019-0328-2

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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. 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 — Echogenic foci associated with malignancy. 41-year-old male with thyroid nodule. Ultrasound image shows a 1.0 cm hypoechoic, solid nodule with spiculated margin. Multiple echogenic foci (Type 6) are present, including echogenic foci with comet-tail artifact (Type 2, arrow). Biopsy result was papillary carcinoma and was confirmed at surgery