title: Dual thyroid ectopia with a normally located pretracheal thyroid gland: case report and literature review.
abstract: BACKGROUND
  Only 1 case with dual thyroid ectopy and a normally located thyroid gland has been reported.
  
  
  METHODS
  We present the case of a 71-year-old woman who had 1-sided lateral neck swelling in the right submandibular space, which grew and doubled in size within 1 year. A CT scan demonstrated 2 right submandibular, lobulated, heterogeneously enhanced masses, an ectopic lingual thyroid, and bilateral thyroid goiter. A Tc-99m sodium pertechnetate thyroid scan revealed a cold area in the right lateral neck region below the submandibular gland, an ectopic lingual thyroid, and bilateral pretracheal thyroids. She underwent total thyroidectomy and en bloc excision of right neck masses. Thyroxin was prescribed following the surgery.
  
  
  RESULTS
  Pathological diagnoses were ectopic thyroid tissue with goitrous change and bilateral thyroid goiter.
  
  
  CONCLUSIONS
  This report demonstrates that dual ectopic thyroid tissue accompanying a normally located thyroid gland can exist and should be differentiated from head and neck malignancies.
authors.affiliation: Division of General Surgery, Chang Gung Memorial Hospital, Chang Gung University, 222, Mai-Chin Road, Keelung, Taiwan. c00156@adm.cgmh.org.tw
authors.forename: Ting-Shuo
authors.initials: TS
authors.lastname: Huang
authors.forename: Huang-Yang
authors.initials: HY
authors.lastname: Chen
mesh_terms: D000368:Aged; D002828:Choristoma; D005260:Female; D006801:Humans; D011856:Radiographic Image Enhancement; D019275:Radiopharmaceuticals; D013670:Sodium Pertechnetate Tc 99m; D013961:Thyroid Gland / Q000000981:diagnostic imaging / Q000473:pathology; D013965:Thyroidectomy; D014057:Tomography, X-Ray Computed
chemical_list: D019275:Radiopharmaceuticals; D013670:Sodium Pertechnetate Tc 99m