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Fig. 7 67-year-old woman with hyperparathyroidism and left
tracheoesophageal groove adenoma that could easily be mistaken for posterior
thyroid nodule. Peripheral, polar vascularity seen on color Doppler sonogram
helps to identify this as adenoma. Subsequent parathyroidectomy preformed at
time of total thyroidectomy revealed this to be a supernumerary hyperplastic
parathyroid gland.