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Induction of hyperparathyroidism by radioactive iodine
American Journal of Surgery
|October 1, 1984
Summary
Radioiodine treatment for thyroid disease may be linked to hyperparathyroidism, particularly parathyroid adenoma. Monitoring serum calcium is crucial for early detection in at-risk patients.
Area of Science:
- Endocrinology
- Oncology
- Nuclear Medicine
Background:
- External head and neck irradiation is a known risk factor for hyperparathyroidism.
- Recent reports suggest a potential association between radioiodine therapy for thyroid conditions and hyperparathyroidism.
Observation:
- Eight middle-aged female patients developed hyperparathyroidism (adenoma or hyperplasia) years after radioiodine treatment.
- Latent periods ranged from 4 to 20 years, with some patients receiving high radioiodine doses (>30 mCi).
- Associated thyroid conditions included cancer, nodules, and thyroiditis.
Findings:
- All patients achieved normal calcium levels post-treatment.
- While experimental models suggest radioiodine's influence, human parathyroid glands show relative radioresistance.
- The co-occurrence of thyroid carcinoma and parathyroid adenoma is a notable indicator of radiation exposure.
Implications:
- Recognizing this association is vital for clinical practice.
- Intermittent serum calcium monitoring can aid in detecting occult hyperparathyroidism in patients with a history of radioiodine exposure.
- Further research may clarify the mechanisms behind parathyroid response to radioiodine.