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

초록

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.

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