Giant parathyroid adenoma demonstrated by dual tracer parathyroid imaging

Noninvasive diagnostic imaging modalities have played an increasingly important role in preoperative localization of parathyroid lesions. The radionuclide method using TI-201 and Tc-99m subtraction imaging is quite successful in detecting such lesions, with a reported sensitivity of 92%. A case of surgically proven primary hyperparathyroidism, caused by an unusually large parathyroid adenoma and detected by the dual tracer method, is presented.