An intrapericardial ectopic thyroid mimicking metastasis in a patient with papillary thyroid cancer: Localization, differential diagnosis by F-18-FDG PET/CT and ablation by I-131

作者：Park Seol Hoon; Seo Minjung; Park Tae Young; Nam Goong Il Seong^*

来源：Hellenic Journal of Nuclear Medicine, 2016, 19(3): 272-274.

• Intrapericardial ectopic thyroid
• Radioactive iodine-I-131
• Papillary thyroid cancer
• F-18-FDG PET

We report a very rare case of incidental intrapericardial thyroid in a papillary thyroid cancer patient. Post ablation scan revealed iodine-131 (I-131) uptake in the mid-chest. Fluorine-18-fluorodeoxyglucose positron emission tomography/computed tomography (F-18-FDG PET/CT) was performed and showed a F-18-FDG avid lesion between the right atrium and the ascending aorta, which was shown to be an ectopic thyroid and not metastasis. The lesion disappeared on a 6 month follow-up I-123 whole body scan while serum thyroglobulin was negative. Although intrapericardial ectopic thyroid is reported to show high iodine uptake, low F-18-FDG avidity of the lesion could be helpful in the exclusion of metastases.

• 出版日期2016-12