抄録
A very rare case of ectopic parathyroid hyperplasia in the submucosa of the pyriform sinus was reported. The patient, a 47 years old male had chronic renal failure induced by hyperparath-yroidism. It was considered that this ectopic parathyroid gland was derived from the fourth brachial pouch and originated from embryologic development of the hypopharyngeal mucosa. The clinical findings and the treatment of ectopic parathyroid hyperplasia due to secondary hyperparathyroidism are discussed.
