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THE QUARTERLY JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING

Rivista di Medicina Nucleare e Imaging Molecolare


A Journal on Nuclear Medicine and Molecular Imaging
Affiliated to the Society of Radiopharmaceutical Sciences and to the International Research Group of Immunoscintigraphy
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REVIEW  UPDATE ON THE DIAGNOSIS AND TREATMENT OF DIFFERENTIATED THYROID CANCER


The Quarterly Journal of Nuclear Medicine and Molecular Imaging 2009 October;53(5):503-12

lingua: Inglese

Diagnostic value of FDG PET/CT imaging

Pace L., Nicolai E., Klain M., Salvatore M.

1 Department of Biomorphological and Functional Sciences, Federico II University, Naples, Italy;
2 Institute of Biostructures and Bioimages, National Council of Research (CNR), Naples, Italy;
3 Institute of Scientific Care and Research (IRCCS), Institute of Nuclear Diagnostics Foundation (SDN),Naples, Italy


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Patients with differentiated thyroid cancer (DTC) have a relatively good overall prognosis, but 20% of them develop local recurrences and 10% distant metastases with relatively high mortality (8%). The current prognostic systems lack the ability to predict outcome of patients when discovered to harbor metastases years later. The introduction of 18-F-fluoro-deoxyglucose (FDG) positron emission tomography (PET) and PET/computed tomograohy (CT) for evaluating patients with DTC has added new information on the disease. This review will summarize the data published so far on the use of FDG in DTC. The most appropriate indication to FDG-PET/CT is in evaluating patients with high thyroglobulin level during follow-up, mainly when radioiodine whole body scan is negative. In this setting, a high accuracy has been reported leading to change in management of patients. A clear relationship has been demonstrated between FDG-PET/CT accuracy and thyroglobulin level, with better results obtained in thyroid stimulating hormone (TSH) stimulated condition. Moreover, FDG imaging provides potentially relevant information on tumour biology, and scan results may enable to prognostically stratify DTC patients with local or distant recurrences. Based on literature data, FDG-PET/CT does not have routine clinical indication in the initial staging of DTC patients, as well as in evaluating cytologically indeterminated thyroid nodules.

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pace@unina.it