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Concomitant papillary thyroid cancer and parathyroid adenoma is rare. We report a 55 years old female with papillary cancer admitted for surgery. Preoperative laboratory findings revealed hypercalcemia and then primary hyperparathyroidism. Thyroidectomy, neck dissection and excision of parathyroid adenoma were performed. Histological examination revealed parathyroid adenoma. Serum calcium returned to normal range after surgery. We recommend preoperative check of calcium in patients with thyroid cancer.