title: [Papillary adenocarcinoma on ectopic thyroid tissue].
abstract: OBJECTIVE
  To report a case of papillary adenocarcinoma occurring on ectopic thyroid tissue in the hyoid bone region.
  
  
  METHODS
  A 57-year-old patient consulted for a cervical mass appearing 1 year before, with no signs of compression. The thyroid function was normal.
  
  
  RESULTS
  The examination showed a firm tumefaction, fixed on the hyoid bone, with undetermined limits, measuring approximately 8 cm. The thyroid gland was in the normal pretracheal position. The cervical tomodensitometry objectified an osteolytic process centered on the hyoid bone with a fleshy zone of tissue density and calcifications. Cervical MRI provided a more precise assessment of the extension of the mass and confirmed the integrity of the other structures, in particular the endo-larynx. The tumor was totally resected via a cervical approach. The pathologic study suggested a papillary adenocarcinoma on ectopic thyroid tissue. The treatment was completed by a total thyroidectomy with normal histological results.
  
  
  CONCLUSIONS
  Papillary adenocarcinoma on ectopic thyroid is a very rare situation. Its diagnosis is histological. Its treatment is primarily surgical, sometimes associated with radioiodine I-131 therapy.
authors.affiliation: Service d'ORL et de chirurgie cervicofaciale, hôpital des spécialités, CHU de Rabat-Salé, Rabat, Maroc. F.NYA@hotmail.com
authors.forename: N
authors.initials: N
authors.lastname: Dib
authors.forename: A
authors.initials: A
authors.lastname: Benhammou
authors.forename: M
authors.initials: M
authors.lastname: Meziane
authors.forename: A
authors.initials: A
authors.lastname: Harmouch
authors.forename: N
authors.initials: N
authors.lastname: Nazih
authors.forename: L
authors.initials: L
authors.lastname: Essakali
authors.forename: M
authors.initials: M
authors.lastname: Kzadri
authors.forename: S
authors.initials: S
authors.lastname: Sefiani
mesh_terms: D000231:Adenocarcinoma, Papillary / Q000473:pathology* / Q000601:surgery; D002828:Choristoma / Q000473:pathology* / Q000601:surgery; D003937:Diagnosis, Differential; D006801:Humans; D006928:Hyoid Bone / Q000473:pathology* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D013961:Thyroid Gland; D013965:Thyroidectomy; D014062:Tongue Neoplasms / Q000473:pathology* / Q000601:surgery; D016896:Treatment Outcome