experimental studies have suggested that in primary hyperparathyroidism ( hpt ) the cells of the hyperfunctioning parathyroid tissue retain some capacity for stimulation and that an increase in secretion of parathyroid hormone ( pth ) can occur when the extracellular calcium concentration is lowered within the hypercalcaemic range .
C0221002
primary hyperparathyroidism
C0030518
parathyroid