A case of parathyroid carcinoma in a 49-year-old female is described. She is found to have renal stones and high serum calcium levels. On physical examination a fixed walnut-sized mass was detected on her right neck. Laboratory studies disclosed a serum calcium level of 12.7 mg/dl, serum phosphorus level of 2.5 mg/dl, serum Ca++ level of 3.12 mEq/l, and positive Gold-Smith test. Computer-assisted tomography scan and ultrasonogram showed a mass in the posterior region of the right lobe of her thyroid. The tumor was resected and histopathological examination showed parathyroid carcinoma. The patient had no evidence of recurrence 2 years following surgery. Our report is the 70th case among Japanese literature.
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