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Technetium-99 m sestamibi imaging in patients with subacute thyroiditis.
Yuji Hiromatsu1, Masatoshi Ishibashi, Hidemi Nishida
1Department of Endocrinology and Metabolism, Kurume University School of Medicine, Kurume, Fukuoka, 830-0011, Japan.
Endocrine Journal
|August 28, 2003
Summary
Subacute thyroiditis (SAT) shows reduced thyroid uptake on Tc-99m pertechnetate scans but increased uptake on Tc-99m sestamibi scans, indicating altered thyroid perfusion during inflammation. These perfusion changes correlate with specific biomarkers in SAT patients.
Area of Science:
- Nuclear Medicine
- Endocrinology
- Radiology
Background:
- Subacute thyroiditis (SAT) is an inflammatory condition of the thyroid gland.
- Understanding thyroid gland perfusion changes in SAT is crucial for diagnosis and management.
Purpose of the Study:
- To investigate regional thyroid perfusion changes in patients with subacute thyroiditis (SAT).
- To evaluate the utility of Tc-99m sestamibi scintigraphy in assessing SAT-related inflammation and perfusion.
Main Methods:
- Tc-99m pertechnetate and Tc-99m sestamibi scintigraphy were performed on 11 SAT patients.
- Scintigraphy findings were correlated with laboratory data and color Doppler ultrasonography.
- Thyroid uptake ratios and clearance rates of Tc-99m sestamibi were analyzed.
Main Results:
- Tc-99m pertechnetate uptake was markedly reduced, while Tc-99m sestamibi showed diffuse increased uptake, suggesting enhanced perfusion in SAT.
- Color Doppler ultrasonography indicated minimal vascularization in the acute phase.
- Decreased early-phase Tc-99m sestamibi clearance and correlations with serum immunosuppressive acidic protein (IAP) and thyrotropin levels were observed.
Conclusions:
- Tc-99m sestamibi scintigraphy may reflect the inflammatory process and altered perfusion in subacute thyroiditis.
- The findings suggest Tc-99m sestamibi uptake in the early phase is indicative of SAT-related inflammation.