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Fig. 6B. —²⁰¹Tl-^99mTc pertechnetate subtraction scintigrams in 61-year-old man with hyperparathyroidism after cervical exploration. Planar scintigram after IV injection of 10 µCi (370 MBq) ^99mTc pertechnetate shows normal distribution of tracer in thyroid gland. Note that focus of tracer uptake in A is not present on ^99mTc pertechnetate portion of examination.