Histologic parathyroid abnormalities in an autopsy series.

Area of Science:

• Endocrinology
• Pathology
• Nephrology

Background:

• Parathyroid gland morphology and function are crucial for calcium homeostasis.
• Age-related changes and renal disease can influence parathyroid gland histology.
• The relationship between parathyroid nodularity, hyperplasia, adenomas, and clinical parameters requires further investigation.

Purpose of the Study:

• To investigate the prevalence and histological features of parathyroid gland abnormalities in a large autopsy cohort.
• To correlate parathyroid gland histology with subject demographics, renal status, and serum calcium levels.

Main Methods:

• Autopsy dissection of parathyroid glands from 422 subjects without significant renal disease.
• Histological evaluation of parathyroid glands, noting cellular arrangement, fat content, nodularity, and cell types.
• Correlation of histological findings with age, sex, renal histology, other diseases, and medical therapy.

Main Results:

• Normal glands showed diffuse cellularity with variable fat. Increased nodularity was observed, especially in enlarged glands.
• Hyperplasia occurred in 7% and adenomas in 2.4% of subjects. Hyperplastic glands were often nodular and asymmetric with increased oxyphil cells.
• Elevated serum calcium levels were associated with adenomas or hyperplastic glands containing large nodules. Nodularity and abnormalities were more common in elderly subjects and those with mild to moderate nephrosclerosis.

Conclusions:

• Parathyroid gland nodularity is indicative of abnormality and may precede the development of adenomas from nodular hyperplasia.
• Age and mild to moderate renal sclerosis are associated with increased prevalence of parathyroid hyperplasia and adenomas.
• No correlation was found between other diseases or medical therapy and parathyroid weight or histology.