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Difficulty: MediumDiagnostic Workup and Test Sequencing

During a routine annual physical examination, a physician identifies a neck mass in a 45-year-old female patient. The patient reports she has felt completely well and has not noticed the lump herself. A detailed review of systems is negative for unintentional weight changes, heat or cold intolerance, resting tremors, dysphagia, or hoarseness. Her past medical history is notable only for mild primary hypertension well-controlled on amlodipine. She has no personal or family history of radiation exposure or endocrine malignancies. On palpation of the neck, there is a discrete, 1.5-cm, firm, and freely mobile nodule located in the right lobe of the thyroid gland. The gland is otherwise normal in size and consistency, and there is no palpable cervical lymphadenopathy. Vital signs are within normal limits.

Which of the following diagnostic studies are indicated as the most appropriate immediate next steps in the evaluation of this patient? (Select exactly 2)

  1. Serum thyroid-stimulating hormone (TSH) levelAnswer
  2. High-resolution thyroid ultrasonographyAnswer
  3. C
    Fine-needle aspiration biopsy
  4. D
    Radioactive iodine uptake scan
  5. E
    Contrast-enhanced computed tomography of the neck

Answer

The most appropriate initial diagnostic steps are a serum thyroid-stimulating hormone (TSH) level and a high-resolution thyroid ultrasonography.
The correct approach to a newly discovered thyroid nodule requires both structural and functional evaluation simultaneously. A serum thyroid-stimulating hormone (TSH) level assesses the functional status (i.e., whether the patient is hyperthyroid, hypothyroid, or euthyroid), which dictates the subsequent pathway. High-resolution thyroid ultrasonography assesses the structural features of the nodule (size, echogenicity, margins, microcalcifications) to stratify the risk of malignancy and guide whether a fine-needle aspiration biopsy is indicated.

Step-by-Step Solution

1
Identify the primary clinical problem from the presentation.
The patient has a newly discovered, asymptomatic, palpable thyroid nodule.
Establishing the central clinical finding dictates the necessary diagnostic pathway.
2
Apply standard diagnostic guidelines for the initial evaluation of a thyroid nodule.
The initial evaluation always requires concurrent structural and functional assessment.
Guidelines emphasize the dual need to rule out hyperfunctioning tissue and to assess sonographic features for malignancy risk.
3
Select the specific tests that fulfill structural and functional assessment.
Serum TSH provides the functional status, while high-resolution thyroid ultrasound provides the structural risk stratification.
Ultrasound determines if the nodule has suspicious features requiring biopsy, while TSH determines if the nodule might be autonomously functioning (which rarely harbors malignancy).

Key Concept

The initial evaluation of a newly discovered thyroid nodule requires simultaneous assessment of function (with serum TSH) and structure (with high-resolution thyroid ultrasound).
Estimated Time:1m 30s
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Diagnostic Workup and Test Sequencing

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