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Ultrasound: 54-year-old woman with primary hyperparathyroidism (PHPT). Transverse grayscale (A) ultrasound image demonstrates an ovoid hypoechoic lesion (white arrow) posterior to the right lobe of the thyroid gland and carotid artery (*) consistent with a parathyroid adenoma. (B) Color doppler ultrasound image shows a polar feeding vessel with peripheral vascularity (white arrowheads).
