Abstract
Abstract Introduction: The pyriform sinus is a rare but known site of ectopic parathyroid adenoma within the upper aerodigestive tract. This entity reflects failure of the inferior parathyroid gland to descend during embryologic development. Surgical excision through a transoral endoscopic approach was performed in a patient with a right pyriform sinus parathyroid adenoma.1 Materials and Methods: A 50-year-old woman with primary hyperparathyroidism underwent a parathyroid gland exploration. Her preoperative sestamibi scan and ultrasonography failed to localize a parathyroid adenoma. Three normal parathyroid glands were identified but the right inferior parathyroid gland was not encountered. She then underwent a 4D CT scan, which identified a right pyriform sinus parathyroid adenoma. She subsequently underwent an uncomplicated transoral endoscopic excision of the parathyroid adenoma with resolution of her primary hyperparathyroidism. Results: The patient's baseline parathyroid hormone (PTH) level was 157.2...
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