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Zorluk: OrtaBreast and Endocrine Surgery

During a routine wellness examination, a 5454-year-old woman is found to have an asymmetric thyroid gland. She reports feeling generally well, though she notes a mild increase in anxiety and occasional loose stools over the past two months. Her heart rate is 92/min92/min and blood pressure is 128/78128/78 mmHgmmHg. Physical examination reveals a non-tender, mobile, 2.82.8 cm nodule in the right lobe of the thyroid gland. There is no palpable cervical lymphadenopathy. Laboratory testing reveals:

Thyroid-stimulating hormone (TSH): 0.040.04 μU/mL\mu U/mL (normal: 0.4−4.00.4-4.0 μU/mL\mu U/mL)
Free thyroxine (T4): 2.12.1 ng/dLng/dL (normal: 0.9−1.70.9-1.7 ng/dLng/dL)

A neck ultrasound confirms a 2.82.8 cm solid, hypoechoic right-sided thyroid nodule with increased internal vascularity. Which of the following is the most appropriate next step in the management of this patient?

  1. Radionuclide thyroid scintigraphyCevap
  2. B
    Fine-needle aspiration biopsy
  3. C
    Right thyroid lobectomy
  4. D
    Measurement of serum thyroglobulin
  5. E
    Observation with repeat ultrasound in 66 months

Cevap

Radionuclide thyroid scintigraphy
In the evaluation of a newly discovered thyroid nodule, the initial step is to measure serum TSH. If the TSH is subnormal (suppressed), the next required step is radionuclide thyroid scintigraphy (typically using Iodine-123 or Technetium-99m). This test determines whether the nodule is autonomously functioning ('hot') or non-functioning ('cold'). A functioning nodule in the setting of hyperthyroidism (toxic adenoma) has a very low risk of malignancy and typically does not require a fine-needle aspiration (FNA) biopsy, whereas a 'cold' nodule requires further evaluation with FNA to rule out malignancy.

Adım Adım Çözüm

1
Evaluate the patient's laboratory results in conjunction with the physical exam findings.
The patient has a clinically significant 2.82.8 cm thyroid nodule with overt biochemical hyperthyroidism (suppressed TSH and elevated Free T4).
The initial laboratory evaluation of any new thyroid nodule dictates the subsequent diagnostic pathway.
2
Determine the appropriate diagnostic algorithm branch based on the TSH level.
Because the TSH is suppressed, a radionuclide thyroid scan is the required next step.
Scintigraphy is necessary to determine if the nodule is autonomously functioning (hyperfunctioning/'hot') or non-functioning ('cold'). Hyperfunctioning nodules rarely harbor malignancy and typically do not require biopsy.

Anahtar Kavram

The diagnostic algorithm for a thyroid nodule relies heavily on the initial TSH level; a subnormal TSH mandates radionuclide scintigraphy before considering fine-needle aspiration.
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