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Difficulty: MediumBreast and Endocrine Surgery

A 50-year-old woman presents to the clinic after a 2.5-cm palpable nodule was found in the right lobe of her thyroid during a routine physical examination. She reports no palpitations, weight changes, dysphagia, or hoarseness. Arrange the following diagnostic and management steps in the most appropriate chronological sequence for this patient. Assume that her initial laboratory testing reveals a subnormal serum TSH level and that subsequent cytological testing indicates malignancy.

  1. 1Measurement of serum thyroid-stimulating hormone (TSH) level and neck ultrasound
  2. 2Radionuclide thyroid scan
  3. 3Ultrasound-guided fine-needle aspiration (FNA) biopsy
  4. 4Surgical resection (e.g., thyroid lobectomy)

Answer

The correct sequence is: TSH and ultrasound -> Radionuclide scan -> FNA biopsy -> Surgical resection.
The standard evaluation sequence for a thyroid nodule starts with checking the TSH level and performing a neck ultrasound. Because the TSH is low, a radionuclide scan is needed to assess whether the nodule is hot or cold. Assuming a cold nodule based on the prompt's instruction that subsequent steps are needed, an FNA biopsy is required. Finally, since the biopsy indicates malignancy, surgical resection is the definitive treatment step.

Step-by-Step Solution

1
Identify the standard initial tests for a palpable thyroid nodule.
Serum TSH and neck ultrasound must be ordered first.
TSH evaluates the functional status of the thyroid, while ultrasound assesses the physical characteristics and size of the nodule.
2
Determine the next diagnostic step based on a subnormal TSH result.
A radionuclide thyroid scan is indicated.
A low TSH suggests an autonomously functioning thyroid nodule. A radionuclide scan determines if the nodule is 'hot' (functional and rarely malignant) or 'cold' (nonfunctional and potentially malignant).
3
Determine the next step for a 'cold' nodule on a radionuclide scan.
Fine-needle aspiration (FNA) biopsy is performed.
Cold nodules have an increased risk of malignancy and require direct cytological sampling to rule out thyroid cancer.
4
Select the appropriate management for a malignant FNA result.
Surgical resection.
Definitive treatment for a malignant thyroid nodule requires surgery, such as a thyroid lobectomy or total thyroidectomy.

Key Concept

Diagnostic workup sequence for a thyroid nodule with subnormal TSH
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Topics

Breast and Endocrine Surgery

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