Which diagnostic test is recommended for all patients with a suspected thyroid nodule?

Which diagnostic test is recommended for all patients with a suspected thyroid nodule?

• A. TSH followed by radionuclide scan if abnormal
• B. Diagnostic ultrasonography is recommended for all patients with a suspected thyroid nodule
• C. CT neck is first-line
• D. MRI is preferred over US

Answer: (B)

High-resolution neck ultrasound is the first-line imaging for any suspected thyroid nodule. It provides immediate, detailed information about how many nodules there are, their size, whether they are solid or cystic, and features that raise or lower cancer risk (such as irregular margins, microcalcifications, hypoechogenicity, or a taller-than-wide shape). This information is crucial because it guides whether a fine-needle aspiration biopsy is needed and how to monitor the nodule over time. Other tests aren’t needed for all patients: checking TSH and using radionuclide scans is helpful to assess thyroid function or a hyperfunctioning (“hot”) nodule, not to characterize nodules themselves, and CT or MRI aren’t first-line due to radiation and less detailed evaluation of small thyroid nodules, being reserved for specific situations like surgical planning or retrosternal extension.

High-resolution neck ultrasound is the first-line imaging for any suspected thyroid nodule. It provides immediate, detailed information about how many nodules there are, their size, whether they are solid or cystic, and features that raise or lower cancer risk (such as irregular margins, microcalcifications, hypoechogenicity, or a taller-than-wide shape). This information is crucial because it guides whether a fine-needle aspiration biopsy is needed and how to monitor the nodule over time. Other tests aren’t needed for all patients: checking TSH and using radionuclide scans is helpful to assess thyroid function or a hyperfunctioning (“hot”) nodule, not to characterize nodules themselves, and CT or MRI aren’t first-line due to radiation and less detailed evaluation of small thyroid nodules, being reserved for specific situations like surgical planning or retrosternal extension.