Which imaging test is performed when fine-needle aspiration results are indeterminate for a thyroid nodule?

Which imaging test is performed when fine-needle aspiration results are indeterminate for a thyroid nodule?

• A. RAIU scan is performed if FNA results are indeterminate
• B. FNA is definitive for malignancy
• C. Ultrasound alone suffices
• D. Surgical exploration is required

Answer: (A)

When thyroid nodule cytology from a fine-needle aspirate is indeterminate, a radionuclide thyroid uptake scan is used to add functional information that helps guide management. This scan shows whether the nodule is hyperfunctioning (hot) or hypofunctioning/cold. A hot nodule indicates autonomous hormone production and is almost always benign, often managed without surgery. A cold or low-uptake nodule raises concern for possible malignancy and prompts further evaluation or consideration of surgical options. Ultrasound findings or FNA results alone can’t reliably distinguish benign from malignant in indeterminate cases, and immediate surgery isn’t the first step unless malignancy risk is clearly high. Thus, the radionuclide uptake scan is the next imaging test to help stratify risk and plan appropriate next steps.

When thyroid nodule cytology from a fine-needle aspirate is indeterminate, a radionuclide thyroid uptake scan is used to add functional information that helps guide management. This scan shows whether the nodule is hyperfunctioning (hot) or hypofunctioning/cold. A hot nodule indicates autonomous hormone production and is almost always benign, often managed without surgery. A cold or low-uptake nodule raises concern for possible malignancy and prompts further evaluation or consideration of surgical options. Ultrasound findings or FNA results alone can’t reliably distinguish benign from malignant in indeterminate cases, and immediate surgery isn’t the first step unless malignancy risk is clearly high. Thus, the radionuclide uptake scan is the next imaging test to help stratify risk and plan appropriate next steps.