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. 2023 Jul 19;50(12):3675–3683. doi: 10.1007/s00259-023-06319-9

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© The Author(s) 2023

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 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. 2 — A–D Colour Doppler and grey scale ultrasound images of a patient successfully treated with RFA for STA. A Before RFA, showing a hypervascular nodule, volume 13.9 mL. B During RFA procedure with typical hyperechoic zones. C 4 months after RFA, volume 3.9 mL. The patient is biochemically euthyroid. No vascularity visible in treated zone but some vascularity in periphery of nodule. D 2 years after RFA treatment. Volume remains 4.0 mL and patient continues to be euthyroid. 2E-F ¹²³I scintigraphy image of thyroid. E Before RFA depicting a left sided hot nodule with near complete suppression of thyroid tissue. F 15 months after RFA. Reduction of volume and autonomy of left sided nodule and increased uptake of thyroid tissue