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Updated: Mar 21, 2026

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Positron Emission Tomography and Thyroid Cancer.

Muammer Urhan1, Ayse Mavi2, Abass Alavi3

  • 1Department of Nuclear Medicine, GATA Haydarpasa Training Hospital, Uskudar, Istanbul, Turkey.

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|May 10, 2016
PubMed
Summary

Differentiated thyroid carcinoma can recur, and radioiodine uptake may decrease. Fluorodeoxyglucose-positron emission tomography (FDG-PET) shows promise for detecting persistent disease, especially when fused with CT or MR imaging.

Keywords:
18-F-fluorodeoxyglucoseDifferentiated thyroid cancerPositron emission tomography

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Area of Science:

  • Oncology
  • Nuclear Medicine
  • Radiology

Background:

  • Differentiated thyroid carcinoma (DTC) has a good prognosis but high recurrence rates.
  • Radioiodine is standard for DTC diagnosis and therapy, but dedifferentiation can impair uptake.
  • Persistent disease after treatment poses challenges for monitoring and management.

Purpose of the Study:

  • To evaluate the utility of 18-F-fluorodeoxyglucose-positron emission tomography (FDG-PET) in detecting persistent or recurrent DTC.
  • To explore the role of FDG-PET in preoperative diagnosis of thyroid nodules.
  • To assess the impact of fusion imaging (PET-CT, PET-MR) on FDG-PET accuracy.

Main Methods:

  • Review of studies utilizing FDG-PET for differentiated thyroid carcinoma.
  • Analysis of FDG-PET performance in patients with negative radioiodine scans.
  • Evaluation of hybrid imaging techniques like PET-CT and PET-MR.

Main Results:

  • FDG-PET is valuable for detecting persistent DTC with negative radioiodine scans.
  • The role of FDG-PET in preoperative nodule evaluation is debated.
  • Fusion imaging (PET-CT, PET-MR) enhances spatial resolution and diagnostic accuracy, particularly for small lesions.

Conclusions:

  • FDG-PET is a crucial functional imaging tool for persistent DTC surveillance.
  • Fusion imaging significantly improves the detection of minimal disease.
  • Further research is needed to define FDG-PET's role in initial nodule characterization.