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Differential wash-out of 99mTc-Sestamibi between the normal thyroid gland and parathyroid adenoma. Early images (a) demonstrate the physiological uptake of 99mTc-sestamibi throughout the thyroid gland, which washes out the delayed images. (b) There is a persistent focus on the uptake, inferior to the right lower pole of the thyroid gland, on the early and delayed images (white arrow), which represents a parathyroid adenoma.
