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Intrathyroidal parathyroid hyperplasia in tertiary hyperparathyroidism.
Byung Seup Kim1, Han Suk Ryu2, Kyung Ho Kang3
1Department of Surgery, Chung-Ang University Hospital, Seoul, Republic of Korea.
Journal of Surgical Case Reports
|June 26, 2014
Summary
This case study highlights intrathyroidal parathyroid hyperplasia, a rare cause of tertiary hyperparathyroidism. Careful evaluation of thyroid masses is crucial in transplant patients with persistent hypercalcemia.
Area of Science:
- Endocrinology
- Surgical Pathology
- Nephrology
Background:
- Tertiary hyperparathyroidism can persist after kidney transplantation, necessitating parathyroidectomy.
- Sustained hypercalcemia post-transplant indicates ongoing parathyroid dysfunction.
- Preoperative imaging may reveal thyroid masses alongside enlarged parathyroid glands.
Observation:
- A patient with tertiary hyperparathyroidism presented with a benign-appearing thyroid mass and enlarged parathyroid glands.
- Intraoperative findings and hormone levels suggested a missed parathyroid gland after initial surgery.
- A subsequent resection of the thyroid nodule revealed intrathyroidal parathyroid hyperplasia.
Findings:
- Frozen biopsy confirmed parathyroid hyperplasia within the thyroid nodule.
- Intraoperative intact parathyroid hormone (iPTH) levels decreased significantly after resection of the intrathyroidal parathyroid tissue.
- This case identifies an intrathyroidal parathyroid adenoma as the cause of persistent hyperparathyroidism.
Implications:
- Benign-looking thyroid masses in patients with secondary or tertiary hyperparathyroidism warrant thorough investigation.
- Intrathyroidal parathyroid hyperplasia should be considered in the differential diagnosis of persistent hypercalcemia.
- Accurate preoperative diagnosis and surgical planning are essential for successful management of hyperparathyroidism.
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