title: Hyperparathyroidism due to primary cystic parathyroid adenoma.
abstract: Three cases of parathyroid cyst are reported, bringing the total of reported functional and nonfunctional parathyroid cysts to 157 cases. Based on our findings a cystic parathyroid adenoma should be defined as a macroscopic cyst with a diameter larger than 1 cm. The three reported cases of functional parathyroid cysts suggest that they are not as rare as reported. Parathyroid cyst should be considered in every patient with a palpable neck mass, certainly in patients with hyperparathyroidism and a fluid-filled lesion at sonography. Functional parathyroid cysts may be multiple, therefore all four parathyroid glands should be identified, as during exploration for hyperparathyroidism. Our three cases show a preference for the inferior site which is in agreement with the literature. Nonfunctional, generally solitary, parathyroid cysts can be cured by percutaneous aspiration.
mesh_terms: D000236:Adenoma / Q000150:complications* / Q000175:diagnosis; D000368:Aged; D003560:Cysts / Q000150:complications*; D005260:Female; D006801:Humans; D006961:Hyperparathyroidism / Q000175:diagnosis / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D010279:Parathyroid Diseases / Q000150:complications*; D010282:Parathyroid Neoplasms / Q000150:complications* / Q000175:diagnosis