Parathyroid Cyst: A Case Report / 대한이비인후과학회지

ABSTRACT

Cysts of the neck may present themselves as thyroid cysts, parathyroid cysts, thyroglossal duct cysts or branchial cleft cysts. Among them, parathyroid cysts are rare in clinical practice. They are usually observed in lower portion of the neck and rarely in the mediastinum or thymus. They are classified either as functioning or non-functioning. In this report, we describe a 49-year old man, with normal thyroid function and normal serum calcium level, presenting mass in the lower left third of the neck. Ultrasonography and computer tomography showed a well defined cystic lesion from the left lower pole of the thyroid to the supraclavicular area, which compressed and displaced the trachea to the right side. Fine needle aspiration of the cyst showed crystalclear watery fluid collection. After aspiration, cysts decreased in size, but the size increased again after a few days later. The patient was operated to remove the cyst and the left thyroid lobe. With the pathological study & analyzation of the cystic fluid for PTH level, the final diagnosis confirmed it as parathyroid cyst.