Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 50 5 2012 05 15 353 354 EN Habibollah Mahmoodzadeh Department of Surgical Oncology, Cancer Institute, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran. Iraj Harirchi Department of Surgical Oncology, Cancer Institute, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran. Maryam Hassan Esfehani Department of Surgical Oncology, Cancer Institute, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran. Abbas Alibakhshi Department of Surgical Oncology, Cancer Institute, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran. 2015 09 28 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. https://acta.tums.ac.ir/index.php/acta/article/view/3911 https://acta.tums.ac.ir/index.php/acta/article/download/3911/3886