The usefulness of preoperative dual-phase 99mTc MIBI-scintigraphy and IO-PTH assay in the treatment of secondary and tertiary hyperparathyroidism.

Background: Persistent secondary or tertiary hyperparathyroidism (HPT) results from failure to remove enough hyperfunctioning parathyroid tissue. Ectopically situated parathyroid glands and supernumerary glands make failure more likely. Recurrent HPT after subtotal Ptx is usually due to regrowth of the remaining parathyroid tissue.