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Fig. 7A. —^99mTc sestamibi-¹²³I subtraction scintigraphy in 58-year-old man with recurrent hyperparathyroidism after cervical exploration. Planar scintigram obtained 20 min after IV injection of 25 µCi (925 MBq) ^99mTc sestamibi reveals focus of tracer uptake just cranial to superior aspect of left lobe of thyroid gland (arrow), consistent with parathyroid adenoma.