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Thyrotoxicosis due to "silent" thyroiditis
Insights
Subacute thyroiditis can present without typical pain or swelling, mimicking hyperthyroidism. A near-zero radioactive iodine uptake is crucial for accurate diagnosis in these challenging thyroid cases.
Area of Science:
- Endocrinology
- Nuclear Medicine
Background:
- Subacute thyroiditis is an inflammatory thyroid condition.
- It typically presents with neck pain, swelling, and symptoms of thyrotoxicosis.
- Diagnostic challenges arise when classic symptoms are absent.
Purpose of the Study:
- To highlight diagnostic challenges in subacute thyroiditis.
- To emphasize the role of radioactive iodine uptake in differentiating thyroid conditions.
- To report on cases of subacute thyroiditis mimicking hyperthyroidism.
Main Methods:
- Case series of 3 patients presenting with thyrotoxicosis.
- Clinical evaluation including assessment for thyroid pain and swelling.
- Measurement of thyroid hormone levels and radioactive iodine uptake (131-I).
Main Results:
- All 3 patients exhibited thyrotoxicosis with elevated thyroid hormones and markedly low 131-I uptake.
- Two male patients had cardiac arrhythmias; the female patient had a goiter.
- Absence of thyroid pain and swelling in all cases.
- Thyrotoxicosis resolved spontaneously within weeks, with one patient developing hypothyroidism.
- Diagnosis of subacute thyroiditis was confirmed based on near-zero 131-I uptake.
Conclusions:
- Subacute thyroiditis can manifest without pain or swelling, complicating diagnosis.
- Radioactive iodine uptake is a critical diagnostic tool for thyroid disorders.
- Low 131-I uptake is key in identifying subacute thyroiditis when hyperthyroidism is suspected.
Abstract:
3 patients (2 male, 1 female) presented with symptoms of thyrotoxicosis associated with elevated blood-levels of thyroid hormone and a markedly depressed thyroidal uptake of 131-I. The male patients (aged 59 and 47) each had a cardiac arrhythmia, but did not have any thyroid pain or swelling. The female with a goitre had no discomfort in the neck. Thyrotoxicosis factitia was excluded by history. The subsequent course of their disease was typical of subacute thyroiditis. The elevated thyroid-hormone levels spontaneously fell to normal over a few weeks. In 1 patient, however, chemical hypothyroidism developed. These patients could have been diagnosed as having hyperthyroidism, rather than subacute thyroiditis, since thyroid pain--and swelling in 2 of the cases--was absent. The correct diagnosis was suspected only after finding a thyroidal uptake of 131-I near zero. The thyroidal uptake of 131-I is still important as a routine diagnostic aid in thyroid disease.