thus , the preoperative identification of parathyroid glands by ultrasonography not only localizes the site of most hyperplastic parathyroid glands ( 70 percent of patients ) , but also detects those patients who have enlarged parathyroid glands , elevated serum parathyroid hormone levels , and severe secondary hyperparathyroidism .
C0030518
parathyroid glands
C0020503
secondary hyperparathyroidism