High-resolution (10-MHz) ultrasonography was performed in 181 patients with primary or secondary hyperparathyroidism during a 4-year period and evaluated retrospectively. Thirty-seven unusual-appearing parathyroid tumors were found among 235 parathyroid glands identified as abnormal. There was pathologic correlation in 36. The typical appearance of parathyroid adenoma was that of an oval hypoechoic or anechoic lesion in the neck, aligned in a craniocaudal direction and often posterior to the thyroid. Morphologic variations from the norm included giant size (n = 11) (4.6%), cystic changes in a solid tumor (n = 9) (3.8%), calcified glands (n = 6[in three patients]) (2.5%), a multilobulated configuration (n = 5) (2.1%), an inhomogeneous pattern (n = 5) (2.1%), and a parathyroid cyst (n = 1) (0.4%). Recognizing the abnormal parathyroid variants can increase the diagnostic accuracy of sonographic examination.
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