Examkin

Soru

Zorluk: OrtaEndocrinology and Metabolism

Evaluate the following clinical scenarios involving patients with altered thyroid function. Match each patient's presentation with the most accurate diagnosis.

  • A 45-year-old woman presents with progressive fatigue, constipation, and a palpable non-tender goiter. Laboratory testing reveals elevated TSH and decreased free T4.Primary hypothyroidism
  • A 32-year-old woman develops severe anterior neck pain, fever, and palpitations following an upper respiratory infection. Laboratory testing reveals suppressed TSH, elevated free T4, and markedly decreased radioactive iodine uptake.Subacute granulomatous thyroiditis
  • A 38-year-old woman reports profound fatigue, amenorrhea, and loss of axillary hair. She had a complicated vaginal delivery with massive hemorrhage two years ago. Laboratory testing reveals low TSH and decreased free T4.Central hypothyroidism
  • A 29-year-old woman reports unintentional weight loss, heat intolerance, and resting tremor. Examination shows proptosis. Laboratory testing reveals suppressed TSH, elevated free T4, and diffusely increased radioactive iodine uptake.Graves disease

Cevap

Vignette 1 matches Primary hypothyroidism; Vignette 2 matches Subacute granulomatous thyroiditis; Vignette 3 matches Central hypothyroidism; Vignette 4 matches Graves disease.
Each provided clinical scenario presents a distinct combination of thyroid function tests (TSH, free T4), radioactive iodine uptake results, and physical examination findings that correspond definitively to a single specific thyroid pathology.

Adım Adım Çözüm

1
Analyze the laboratory profile and clinical context for the first vignette.
Identified primary thyroid failure characterized by elevated TSH and low free T4.
TSH elevation is the appropriate physiologic response to low peripheral thyroid hormone, indicating that the defect is intrinsic to the thyroid gland itself.
2
Evaluate the second vignette's presentation of neck pain, recent viral illness, and thyrotoxicosis with low uptake.
Matched with subacute granulomatous thyroiditis.
The low radioactive iodine uptake distinguishes destructive thyroiditis (where preformed hormone leaks from damaged follicles) from hyperthyroidism caused by increased de novo hormone synthesis.
3
Assess the third vignette's combination of low TSH and low free T4 in a patient with a history of severe obstetric hemorrhage.
Identified central hypothyroidism secondary to suspected Sheehan syndrome.
An inappropriately low or normal TSH in the face of low free T4 indicates a central axis defect rather than primary thyroid pathology.
4
Correlate the fourth vignette's findings of proptosis, thyrotoxicosis, and high uptake.
Matched with Graves disease.
Diffusely increased radioactive iodine uptake demonstrates glandular overactivity, and proptosis is a highly specific manifestation of Graves disease caused by TSH receptor-stimulating autoantibodies.

Anahtar Kavram

Interpretation of Thyroid Function Tests and Radioactive Iodine Uptake
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Konular

Endocrinology and Metabolism

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