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KMID : 1202020090020010001
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Journal of Korean Thyroid Association
2009 Volume.2 No. 1 p.1 ~ p.6
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Use of FDG-PET in Thyroid Disorder
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Shong Young-Kee
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Abstract
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18F-fluorodeoxyglucose positron-Emission Tomography (FDG-PET) is very useful for the follow up of differentiated thyroid carcinoma. FDG-PET could determinate the recurrent or metastatic foci of thyroid cancer in 70∼90% of patients with elevated thyrogobulin level during thyroid hormone withdrawal, especially whose I-131 whole body scan were negative. However, currently neck ultrasonography (USG) is the primary choice to detect recurrent disease in neck because FDG-PET is rather expensive and available only in limited center. FDG-PET could be recommended in patients with negative USG result or for detecting distant metastasis in patients with local recurrence. The number of patients with incidentally found FDG uptake in thyroid gland after FDG-PET or PET/CT was increased. Diagnostic procedures such as USG and cytological examination or pathological examination including hemithyroidectomy were essential for these patients due to the high risk of malignancy. FDG-PET did not have any advantage for the preoperative evaluation comparing other diagnostic modalities. It could be selectively used in the high risk patients.
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KEYWORD
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Thyroid, Fluorodeoxyglucose F18, Positron-emission tomography
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