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99mTc-sestamibi SPECT (a) and 123I/99mTc-sestamibi subtraction SPECT (b) coronal images for a 34-year-old man with secondary hyperparathyroidism. Three hyperplastic parathyroid glands not visualized in coronal 99mTc-sestamibi image are clearly visible in the subtraction SPECT coronal image (b).
