A 58-year-old woman was referred to our department because of globus. X-ray examination, real-time ultrasonography, CT, and MRI were performed. A parathyroid tumor was revealed at the back of the left lobe of the thyroid. A functional parathyroid adenoma was suspected based on the results of a fine needle aspiration biopsy and high serum levels of both calcium (12.4mg/dl) and PTH (2800pg/ml). The patient subsequently underwent surgery. During surgery a parathyroid tumor was removed and the histological diagnosis was benign parathyroid adenoma.