Abstract:Introduction: Parathyroid carcinoma (PC) is a rare malignancy with a high rate of recurrence and metastasis. Case: A 63-year-old man with a 13-year history of recurrent PC requiring 5 operations, including parathyroidectomies, thyroidectomy, and neck dissections presented with polyuria, polydipsia, and worsening rib pain. He had been recently treated with 6 monthly octreotide injections and maximal dose cinacalcet for gradually rising Ca/PTH levels. Tests revealed serum Ca 13.1mg/dL (8-10.5mg/dL), PTH 1750pg/m… Show more
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