Abstract
A patient with chronically increased hypercalcemia had a chest X-ray that demonstrated an enlarged mass in the upper mediastinum. Cervicothoracic CT was performed to determine the origin of this mass, but was inconclusive. The patient underwent parathyroid Tc-99m sestamibi scintigraphy which showed a large mass with increased uptake and a photopenic area inside, suggesting a parathyroid lesion. After surgery, a 30 g mass with cysts and hemorrhagic areas inside was histologically confirmed as a parathyroid adenoma.
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