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a Normal parathyroid glands are sometimes detectable, appearing as small oval homogeneously hyperechoic structures (left inferior parathyroid gland, transverse and sagittal views, open arrows). T trachea, CCA common carotid artery. b Hypercellular parathyroids (both adenomas and hyperplastic glands) usually appear as hypoechoic well-circumscribed ovoid structures (left inferior parathyroid adenoma, transverse and sagittal view). LN adjacent benign lymph node
