Coexisting thyroid and parathyroid disease--are they related?

Area of Science:

• Endocrinology
• Pathology
• Surgical Oncology

Background:

• Previous studies suggested a high prevalence of non-C cell thyroid disease in primary hyperparathyroidism (HPT).
• Experimental evidence linking these distinct gland lesions was lacking.
• The coexistence of thyroid and parathyroid lesions may be coincidental due to shared risk factors.

Purpose of the Study:

• To investigate the association between thyroid gland disease and primary hyperparathyroidism (HPT).
• To determine if thyroid lesions are more prevalent in patients with HPT compared to controls.
• To examine the incidence of parathyroid adenomas in patients with thyroid disease.

Main Methods:

• Analysis of 124 parathyroidectomy cases matched with autopsy controls.
• Comparison of macroscopic and microscopic thyroid lesions between HPT patients and controls.
• Evaluation of parathyroid adenoma prevalence in thyroidectomy patients.

Main Results:

• No significant difference in total macroscopic thyroid lesions between HPT and control groups.
• A higher prevalence of macroscopic nonmedullary thyroid carcinomas was observed in the HPT group (P < 0.001).
• No increased association found between parathyroid adenomas and nonmedullary thyroid disease.

Conclusions:

• Macroscopic nonmedullary thyroid carcinomas are an exception, but generally thyroid disease does not accompany HPT.
• Parathyroid adenomas were not more frequent in surgical thyroid disease.
• The coexistence of thyroid and parathyroid lesions is likely attributed to their high prevalence in middle-aged women.