A 42-year-old woman undergoes total thyroidectomy for a 3 cm classical variant papillary thyroid carcinoma. Final pathology confirms angioinvasion and microscopic positive margins. Two of five central compartment nodes are positive. According to ATA 2015 guidelines, what is the most appropriate initial postoperative management regarding radioactive iodine?

• A No radioactive iodine is indicated; TSH suppression alone is sufficient
• B Radioactive iodine ablation is recommended as this places the patient in the intermediate-risk category ✓
• C Radioactive iodine is indicated only if thyroglobulin is elevated on follow-up
• D External beam radiotherapy to the neck is preferred over radioactive iodine

Explanation

According to the ATA 2015 risk stratification, this patient falls into the intermediate-risk category due to angioinvasion, microscopic positive margins, and central nodal metastases (N1a). Intermediate-risk differentiated thyroid cancer warrants radioactive iodine remnant ablation. Low-risk features include intrathyroidal tumors under 4 cm without metastases. High-risk features include gross extrathyroidal extension or distant metastases. TSH suppression alone is insufficient for intermediate-risk disease. External beam radiotherapy is reserved for unresectable gross residual disease.

Reference: Harrison's Principles of Internal Medicine, 21st ed.

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Written and medically reviewed by the StethoPrep medical team.