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Metastatic thyroid cancer occurring as an unknown primary lesion: the role of F-18 FDG positron emission tomography
F Dede1, N D Ajoedi, S M Ansari
1Nuclear Medicine Section, Department of Radiology, St. Vincent's Catholic Medical Centers of New York, New York Medical College, 153 West 11 Street, New York, NY 10011,USA.
Abstract:
Thyroid cancer can appear as metastatic disease of an unknown primary origin, and fluorine-18 fluorodeoxyglucose (F-18 FDG) positron emission tomographic (PET) studies are helpful in the workup evaluation of these patients. The authors describe two patients who had metastatic disease from an unknown primary lesion. F-18 FDG PET studies played an important role in localizing the primary malignant site in the thyroid gland. The utility of F-18 FDG imaging in decreasing the number of procedures, cost, and inconvenience to patients is shown clearly in both cases.
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