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We performed a retrospective review of (18)F-fluorodeoxyglucose positron emission tomography (FDG-PET) examination to determine the prevalence of thyroid FDG-PET incidentaloma in a patient group evaluated for metastasis of cancer and in a group of healthy subjects who underwent voluntary cancer screening. We also evaluated the risk of malignancy in focal thyroid FDG-PET incidentaloma and its association with standard uptake values (SUVs) (maximum and greater than 0.75 threshold). A total of 1330 subjects underwent FDG-PET for metastasis evaluation (n = 999) and cancer screening (n = 331). Twenty-nine of 1330 subjects (2.2%) showed focal (n = 21) or diffuse (n = 8) thyroid FDG-PET incidentaloma. There was no significant difference in the prevalence of thyroid FDG-PET incidentaloma between the two groups (19 of 999 vs. 10 of 331; P &gt; 0.05). Four of 15 focal incidentalomas (26.7%) whose histological diagnoses were available showed papillary thyroid cancer. The maximum SUV (16.5 +/- 4.70) and greater than 0.75 threshold SUV (14.2 +/- 5.3) of malignant lesions were significantly higher than those of benign tumors (6.5 +/- 3.8 and 4.9 +/- 3.0; P &lt; 0.05). In conclusion, thyroid FDG-PET incidentaloma has prevalence of 2.2%, and its prevalence was not different according to the purpose of the FDG-PET. The focal thyroid FDG-PET incidentaloma carries a high risk of malignancy, especially in cases with high SUVs. Therefore, focal thyroid FDG-PET incidentaloma with high SUVs warrants a pathological diagnostic procedure if it changes a patient's treatment plan or prognosis.

the journal of clinical endocrinology and metabolism/journal of clinical endocrinology and metabolism

Prevalence and Risk of Cancer of Focal Thyroid Incidentaloma Identified by<sup>18</sup>F-Fluorodeoxyglucose Positron Emission Tomography for Metastasis Evaluation and Cancer Screening in Healthy Subjects

Prevalence and Risk of Cancer of Focal Thyroid Incidentaloma Identified by18F-Fluorodeoxyglucose Positron Emission Tomography for Metastasis Evaluation and Cancer Screening in Healthy Subjects

Prevalence and Risk of Cancer of Focal Thyroid Incidentaloma Identified by¹⁸F-Fluorodeoxyglucose Positron Emission Tomography for Metastasis Evaluation and Cancer Screening in Healthy Subjects