Final answer:
Indications for parathyroidectomy in tertiary hyperparathyroidism include hypercalcemia, renal osteodystrophy, and vascular calcification that further impairs cardiac function.
Step-by-step explanation:
Indications for parathyroidectomy in tertiary hyperparathyroidism include hypercalcemia, renal osteodystrophy, and vascular calcification that further impairs cardiac function. Tertiary hyperparathyroidism occurs when primary hyperparathyroidism is left untreated and progresses to severe calcium and bone abnormalities. Parathyroidectomy, the surgical removal of the parathyroid glands, is necessary in cases where medical management fails to control the symptoms and complications associated with tertiary hyperparathyroidism.