An Interesting Case of Hypercalcemia: Intrathyroidal Parathyroid Adenoma

Abstract

Hyperparathyroidism is the most common cause of hypercalcemia in the general population, with most patients presenting with mild to moderate hypercalcemia on routine bloodwork. Serum parathyroid hormone levels, followed by neck imaging studies, are helpful in diagnosing and localizing parathyroid adenomas. Ectopic parathyroid adenoma causes diagnostic challenges. Here, we present the patient case of a 65-year-old man with severe and symptomatic hypercalcemia who was found to have an intrathyroidal parathyroid adenoma, confirmed only after thyroid resection. Although imaging and laboratory results were helpful in our evaluation, pathology was the key to establishing the final diagnosis.