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Hyperthyroidism with metastatic follicular thyroid carcinoma.
Summary
This study details a hyperthyroid patient with metastatic thyroid cancer who achieved euthyroid status after thyroidectomy and two I-131 treatments. Elevated thyroid stimulating immunoglobulin normalized, suggesting a new classification for hyperthyroidism causes in thyroid carcinoma.
Area of Science:
- Endocrinology
- Oncology
- Nuclear Medicine
Background:
- Metastatic follicular thyroid carcinoma can present with hyperthyroidism.
- Thyroid stimulating immunoglobulin (TSIg) levels are often elevated in such cases.
Observation:
- A 70-year-old woman with metastatic follicular thyroid carcinoma and elevated TSIg underwent total thyroidectomy.
- Initial hyperthyroidism persisted post-surgery, requiring two radioactive iodine (I-131) therapies (218 mCi and 220 mCi).
Findings:
- The patient achieved a euthyroid state after the second I-131 dose and remained so without hormone replacement.
- Post-treatment, TSIg levels became undetectable.
- The metastatic lesions were likely the source of hormone overproduction.
Implications:
- This case suggests a potential therapeutic approach for managing hyperthyroidism in metastatic thyroid cancer.
- The normalization of TSIg may indicate successful treatment of the underlying cause.
- A tentative classification of hyperthyroidism causes in thyroid carcinoma is proposed based on these findings.