title: Parathyroid cyst: current diagnostic and management principles.
abstract: BACKGROUND
  Parathyroid (PTH) cyst is a rare lesion. Only about 200 cases have been reported to date. The diagnosis of a PTH cyst is difficult, particularly in its differentiation from thyroid cyst. It has clinical significance because PTH cysts can mimic a thyroid mass and can be associated with hyperparathyroidism.
  
  
  METHODS
  This presentation illustrates an additional case of a PTH cyst. The importance of fine-needle aspiration (FNA) in the diagnosis of PTH cyst and its management are discussed.
  
  
  RESULTS
  Fine-needle aspiration of clear fluid containing an elevated PTH hormone level proved to be diagnostic in the patient. Recurrence of the cyst after FNA required surgical resection. The current concepts of etiology and treatment are summarized.
  
  
  CONCLUSIONS
  PTH cyst should be in the differential diagnosis in any patient initially seen with an anterior cystic neck mass. Radiologic imaging and FNA can accurately diagnose PTH cysts. Surgical excision may be needed for recurrent cysts after aspiration.
authors.affiliation: Division of Otolaryngology, Mount Sinai Medical Center, Chicago, Illinois 60608, USA.
authors.forename: A
authors.initials: A
authors.lastname: Alvi
authors.forename: D
authors.initials: D
authors.lastname: Myssiorek
authors.forename: P
authors.initials: P
authors.lastname: Wasserman
mesh_terms: D000328:Adult; D001707:Biopsy, Needle; D003560:Cysts / Q000175:diagnosis* / Q000628:therapy; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D010279:Parathyroid Diseases / Q000175:diagnosis* / Q000628:therapy; D010281:Parathyroid Hormone / Q000032:analysis; D012008:Recurrence
chemical_list: D010281:Parathyroid Hormone