Parathyroid Adenoma without Hyperparathyroidism Presenting as a Large Neck Mass

Parathyroid adenoma is a benign neoplasm and accounts for 80∼90% of primary hyperparathyroidism. It is usually accompanied by hypercalcemia, and parathyroid adenomas with normal levels of serum parathyroid hormone (PTH) and calcium have been rarely reported in the literature. We report the case of a 16-year-old female with a large anterior neck mass who had a parathyroid adenoma without hyperparathyroidism. She underwent right thyroid lobectomy due its misinterperetation as a thyroid tumor thenultimately discovered to have been a parathyroid lesion.