Abstract
We report a very rare case of incidental intrapericardial thyroid in a papillary thyroid cancer patient. Post ablation scan revealed iodine-131 (131I) uptake in the mid-chest. Fluorine-18-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) was performed and showed a 18F-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 123I whole body scan while serum thyroglobulin was negative. Although intrapericardial ectopic thyroid is reported to show high iodine uptake, low 18F-FDG avidity of the lesion could be helpful in the exclusion of metastases.
MeSH terms
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Carcinoma / diagnostic imaging
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Carcinoma / secondary
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Carcinoma, Papillary
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Choristoma / diagnostic imaging*
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Choristoma / radiotherapy*
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Diagnosis, Differential
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False Positive Reactions
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Female
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Fluorodeoxyglucose F18*
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Heart Diseases / diagnostic imaging*
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Heart Diseases / radiotherapy*
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Heart Neoplasms / diagnostic imaging
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Heart Neoplasms / secondary
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Humans
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Iodine Radioisotopes / therapeutic use
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Middle Aged
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Positron Emission Tomography Computed Tomography / methods
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Radiopharmaceuticals / therapeutic use
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Thyroid Cancer, Papillary
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Thyroid Gland / diagnostic imaging*
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Thyroid Neoplasms / diagnostic imaging
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Thyroid Neoplasms / secondary
Substances
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Iodine Radioisotopes
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Radiopharmaceuticals
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Fluorodeoxyglucose F18