A 37-year-old woman has had difficulty swallowing and a feeling of fullness in the anterior neck for the past week. She is recovering from a mild upper respiratory tract infection 1 month ago. On physical examination, her temperature is 37.4degC, pulse is 74/min, respirations are 16/min, and blood pressure is 122/80 mm Hg. Palpation of her diffusely enlarged thyroid elicits pain. Laboratory studies show an increased serum T4 level and a decreased TSH level. Two months later, she no longer has these complaints. The T4 the level is now normal. Which of the following conditions is most likely to have produced these findings?
A 37-year-old woman has had difficulty swallowing and a feeling of fullness in the anterior neck for the past week. She is recovering from a mild upper respiratory tract infection 1 month ago. On physical examination, her temperature is 37.4degC, pulse is 74/min, respirations are 16/min, and blood pressure is 122/80 mm Hg. Palpation of her diffusely enlarged thyroid elicits pain. Laboratory studies show an increased serum T4 level and a decreased TSH level. Two months later, she no longer has these complaints. The T4 the level is now normal. Which of the following conditions is most likely to have produced these findings?
💡 Explanation
**Core Concept**
The patient is presenting with symptoms of thyroid gland inflammation, specifically thyroid tenderness and difficulty swallowing (due to possible thyroid gland enlargement). This is likely caused by a condition known as thyroiditis, which is characterized by inflammation of the thyroid gland.
**Why the Correct Answer is Right**
The patient's symptoms and laboratory findings are consistent with a diagnosis of thyroiditis. Specifically, the increased serum T4 level and decreased TSH level suggest a condition known as subacute (de Quervain) thyroiditis. This condition typically occurs after a viral upper respiratory tract infection and is characterized by a painful, enlarged thyroid gland. The inflammation caused by the viral infection leads to the release of stored thyroid hormones (T4) into the bloodstream, resulting in an increased T4 level. The TSH level decreases in response to the high T4 level, as the body attempts to reduce thyroid hormone production.
**Why Each Wrong Option is Incorrect**
**Option A:** Silent thyroiditis is a form of thyroiditis that typically presents with a transient hyperthyroid phase, but it is not associated with thyroid tenderness.
**Option B:** Hashimoto thyroiditis is an autoimmune form of thyroiditis that typically presents with hypothyroidism, not hyperthyroidism.
**Option C:** Graves' disease is an autoimmune form of hyperthyroidism that is not associated with thyroid tenderness or a transient hyperthyroid phase.
**Option D:** Riedel's thyroiditis is a rare form of thyroiditis that is characterized by a hard, fibrotic thyroid gland, but it is not associated with thyroid tenderness or a transient hyperthyroid phase.
**Clinical Pearl / High-Yield Fact**
Subacute (de Quervain) thyroiditis is a condition that typically occurs after a viral upper respiratory tract infection and is characterized by a painful, enlarged thyroid gland. It is essential to recognize this condition, as it can be self-limiting and does not require long-term thyroid hormone replacement therapy.
**Correct Answer: B. Hashimoto thyroiditis is incorrect. The correct answer is actually C. Graves' disease is incorrect. The correct answer is actually D. Riedel's thyroiditis is incorrect. The correct answer is actually A. The correct answer is A. Subacute (de Quervain) thyroiditis.
✓ Correct Answer: C. Subacute granulomatous thyroiditis
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