title: [Ectopic parathyroid gland hyperplasia in the pyriform sinus].
abstract: OBJECTIVE
  To explore the diagnosis and treatment of the ectopic parathyroid gland in the pyriform sinus.
  
  
  METHODS
  Retrospectively analysis of 1 case with ectopic parathyroid gland in the pyriform sinus and retrospectively review the past literatures.
  
  
  RESULTS
  The cases with the ectopic parathyroid gland in the pyriform sinus reported in the past literatures included: 2 with parathyroid gland tissues, 3 with hyperplasia, the other 1 with adenoma. The case reported by us was with adenoma.
  
  
  CONCLUSIONS
  The ectopic parathyroid gland hyperplasia in the pyriform sinus is rarely reported before and it usually causes misdiagnosis. Better knowledge of the different position of the ectopic parathyroid gland hyperplasia in the pyriform sinus will help diagnosing and treating it.
authors.affiliation: Department of Otorhinolaryngology, Changzheng Hospital, Second Military Medical University, Shanghai, 200003, China. fanjingp@163.com
authors.forename: Jingping
authors.initials: J
authors.lastname: Fan
authors.forename: Yumei
authors.initials: Y
authors.lastname: Yang
authors.forename: Shunzhang
authors.initials: S
authors.lastname: Lin
authors.forename: Aihua
authors.initials: A
authors.lastname: Sun
mesh_terms: D002828:Choristoma / Q000175:diagnosis / Q000628:therapy; D005260:Female; D006801:Humans; D006965:Hyperplasia / Q000628:therapy; D008875:Middle Aged; D010279:Parathyroid Diseases / Q000175:diagnosis* / Q000628:therapy*; D010280:Parathyroid Glands / Q000473:pathology*; D056144:Pyriform Sinus / Q000473:pathology*