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. 2023 Aug 27;15(17):4290. doi: 10.3390/cancers15174290

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Radioiodine-refractory metastatic differentiated thyroid cancer with positive lesions on [¹⁸F]FDG PET and negative [¹⁸F]FAPI-74 PET. Legend: Sixty-four-year-old patient with RAI-negative (not shown) papillary thyroid cancer after 15 GBq ¹³¹I. (Left): [¹⁸F]FAPI-74 PET shows a physiological tracer distribution. (Right): [¹⁸F]FDG PET depicts in discordance with [¹⁸F]FAPI-74 local relapse and multiple pulmonary metastases (red arrows).