Hybrid Molecular Imaging in Differentiated Thyroid Carcinoma

Area of Science:

• Nuclear Medicine
• Oncology
• Radiology

Background:

• Radioiodine isotopes are vital for diagnosing and treating differentiated thyroid carcinoma (DTC).
• Sodium-iodide symporter (NIS) expression and activity dictate radioiodine uptake in thyroid cancer.
• Standard planar or SPECT imaging offers limited morphological detail, impacting diagnostic accuracy.

Purpose of the Study:

• To evaluate the diagnostic and therapeutic benefits of hybrid SPECT/CT imaging in DTC.
• To explore alternative imaging modalities for DTC recurrence when NIS expression is lost.

Main Methods:

• Utilized SPECT/CT hybrid systems for improved morphological visualization of radioiodine distribution.
• Investigated the role of 18F-deoxyglucose Positron Emission Tomography/Computed Tomography (PET/CT) in cases with absent NIS expression.

Main Results:

• SPECT/CT enhances diagnostic accuracy and therapeutic management in approximately one-third of DTC patients with unclear radioiodine uptake.
• SPECT/CT has emerged as the gold standard for nuclear imaging in DTC.
• 18F-deoxyglucose PET/CT is effective for diagnosing and localizing DTC recurrence when NIS is downregulated, guiding surgical intervention.

Conclusions:

• SPECT/CT significantly improves the management of differentiated thyroid carcinoma.
• PET/CT serves as a valuable tool for detecting DTC recurrence in NIS-negative tumors, particularly for surgical planning.