An intrapericardial ectopic thyroid mimicking metastasis in a patient with papillary thyroid cancer: Localization, differential diagnosis by18F-FDG PET/CT and ablation by131I.
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 a18F-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-up123I whole body scan while serum thyroglobulin was negative. Although intrapericardial ectopic thyroid is reported to show high iodine uptake, low18F-FDG avidity of the lesion could be helpful in the exclusion of metastases.
Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, 877 Bangeojinsunhwando-ro, Dong-gu, Ulsan, Korea. isnamgoong@hanmail.net.
Seol Hoon
SH
Park
Minjung
M
Seo
Tae Young
TY
Park
Seong
S
Nam-Goong
D002277:Carcinoma / Q000000981:diagnostic imaging / Q000556:secondary; D002291:Carcinoma, Papillary; D002828:Choristoma / Q000000981:diagnostic imaging* / Q000532:radiotherapy*; D003937:Diagnosis, Differential; D005189:False Positive Reactions; D005260:Female; D019788:Fluorodeoxyglucose F18; D006331:Heart Diseases / Q000000981:diagnostic imaging* / Q000532:radiotherapy*; D006338:Heart Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary; D006801:Humans; D007457:Iodine Radioisotopes / Q000627:therapeutic use; D008875:Middle Aged; D000072078:Positron Emission Tomography Computed Tomography / Q000379:methods; D019275:Radiopharmaceuticals / Q000627:therapeutic use; D000077273:Thyroid Cancer, Papillary; D013961:Thyroid Gland / Q000000981:diagnostic imaging*; D013964:Thyroid Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary
D007457:Iodine Radioisotopes; D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18