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Zorluk: KolayBreast and Endocrine Surgery

A 42-year-old woman comes to the clinic for evaluation of a newly noticed lump in her anterior neck. She reports no pain, hoarseness, dysphagia, or recent changes in her weight. Physical examination reveals a non-tender, 2.5-cm, mobile nodule in the right lobe of the thyroid gland. A neck ultrasound confirms a 2.5-cm solid, hypoechoic nodule in the right thyroid lobe with regular margins. Laboratory studies show a serum thyroid-stimulating hormone (TSH) level of 0.1 mU/L (normal: 0.4-4.0 mU/L). Which of the following is the most appropriate next step in management?

  1. Radionuclide thyroid scanCevap
  2. B
    Fine-needle aspiration biopsy
  3. C
    Initiation of levothyroxine therapy
  4. D
    CT scan of the neck with contrast
  5. E
    Right thyroid lobectomy

Cevap

Radionuclide thyroid scan
According to the standard diagnostic algorithm for thyroid nodules, the initial evaluation requires a serum TSH level and a thyroid ultrasound. If the TSH is subnormal (suppressed), a radionuclide thyroid scan (e.g., using Iodine-123 or Technetium-99m) is indicated to assess the functional status of the nodule. Hyperfunctioning ('hot') nodules are rarely malignant and typically require evaluation and treatment for hyperthyroidism rather than biopsy. Non-functioning ('cold') nodules have a higher risk of malignancy and generally require a subsequent fine-needle aspiration biopsy.

Adım Adım Çözüm

1
Identify the primary clinical problem and initial findings.
The patient has a palpable 2.5-cm solid thyroid nodule confirmed by ultrasound.
Establishing the baseline clinical scenario is required before interpreting the diagnostic algorithm.
2
Evaluate the initial laboratory results.
The serum TSH level is 0.1 mU/L, which is suppressed (below the normal range).
The TSH value dictates the diagnostic pathway for evaluating a thyroid nodule.
3
Determine the next indicated step based on the TSH level.
A radionuclide thyroid scan is chosen.
When TSH is subnormal, a radionuclide scan is required to determine if the nodule is hyperfunctioning (hot) or non-functioning (cold), as hot nodules are rarely malignant.

Anahtar Kavram

Evaluation of a thyroid nodule with a suppressed TSH level
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Konular

Breast and Endocrine Surgery

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