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Fig. 1B —57-year-old man with persistent primary hyperparathyroidism after exploratory surgery. Fused multiplanar images from SPECT-CT acquisition localize uptake to deep-seated left inferior parathyroid adenoma lying adjacent to anterolateral border of vertebral body (arrows). This was not seen on sonography because of its position posterior to the trachea. SPECT-CT guided minimally invasive surgical intervention, which confirmed a solitary parathyroid adenoma.