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18F-Fluorodeoxyglucose (FDG) PET/CT Follow-Up in Radioiodine-Refractory Papillary Thyroid Carcinoma: A Case Report
David Gutierrez Albenda1, Valeria Armani Arce2, Ernesto Balmaceda Araya2
1Cyclotron-PET/CT Laboratory, University of Costa Rica, San José, CRI.
Abstract:
Thyroid carcinoma is the most frequent endocrine malignancy, and papillary thyroid carcinoma (PTC) is its predominant subtype. Standard initial management includes surgical resection followed by radioactive iodine (¹³¹I) ablation. PET with fluorodeoxyglucose (¹⁸F-FDG) combined with CT (FDG-PET/CT) has emerged as a valuable tool during follow-up, particularly in cases of radioiodine-refractory disease. We report the case of a 67-year-old man with PTC refractory to multiple ¹³¹I therapies, whose disease progression was monitored using serial FDG-PET/CT imaging. This case highlights the role of FDG-PET/CT in guiding treatment selection in advanced PTC.
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