Humoral Hypercalcemia of Malignancy Caused by Parathyroid Hormone-Related Protein-Secreting Medullary Thyroid Carcinoma: A Case Report

Herein, we present a rare case of MTC that caused hypercalcemia via PTHrP production. Although HHM is uncommon in thyroid cancer, the condition can cause severe hypercalcemia requiring prompt diagnosis and treatment. HHM should be considered in patients with thyroid cancer with hypercalcemia, and PTHrP measurement may aid in the diagnosis.