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Fig. 1B. —50-year-old man with hyperparathyroidism. Longitudinal sonogram obtained with 6-MHz linear transducer shows deeper tissue penetration than revealed in A. Note hypoechoic focus (cursors) with poor sound transmission, consistent with parathyroid adenoma. Although sonographic evaluation of patients with hyperparathyroidism generally requires use of high-frequency (7- to 15-MHz) linear transducers to achieve maximal spatial resolution, care is required to visualize posterior aspects of thyroid gland, thereby ensuring that most common position for abnormal parathyroid tissue is evaluated.

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