title: A case of ectopic parathyroid gland hyperplasia in the pyriform sinus.
abstract: Variability in the location of parathyroid glands is well recognized. There are usually 4 parathyroid glands located in the area of the thyroid gland, but embryologically, they may be found anywhere from the angle of the jaw to the pericardium. We report a case of an ectopic parathyroid gland in the pyriform sinus. It appeared as a tumorous lesion in the pyriform sinus owing to progress of secondary hyperparathyroidism.
authors.affiliation: Department of Otolaryngology, Chiba Hokusoh Hospital, Nippon Medical School, 1715 Kamakari, Inba-mura, Inba-gun, Chiba 270-1694, Tokyo, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Fukumoto
authors.forename: Manabu
authors.initials: M
authors.lastname: Nonaka
authors.forename: Tomonobu
authors.initials: T
authors.lastname: Kamio
authors.forename: Eriko
authors.initials: E
authors.lastname: Kamura
authors.forename: Chika
authors.initials: C
authors.lastname: Ozu
authors.forename: Shunkichi
authors.initials: S
authors.lastname: Baba
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Ohaki
mesh_terms: D000328:Adult; D002828:Choristoma / Q000175:diagnosis / Q000473:pathology*; D005260:Female; D006801:Humans; D006961:Hyperparathyroidism / Q000473:pathology / Q000601:surgery; D006965:Hyperplasia; D007828:Laryngoscopy; D010280:Parathyroid Glands; D016105:Parathyroidectomy; D010608:Pharyngeal Diseases / Q000175:diagnosis / Q000473:pathology*