Incidental thyroid uptake is found in approximately 2.5% of patients who undergo FDG PET for nonthyroid malignancy; approximately a third of the FDG PET thyroid incidentalomas are malignant, including primary thyroid malignancies and metastasis. We describe a 50-year-old woman, a potential heart transplant candidate with history of breast cancer, who was found by FDG PET/CT to harbor a large thyroid mass with intense FDG uptake. Biopsy and molecular study demonstrated that the thyroid mass was a Hürthle cell adenoma. This case highlights that Hürthle cell neoplasm should be included in the differential diagnosis of a thyroid nodule with very high FDG avidity.
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