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[Ectopic thyroid].

S Oueslati1, W Douira, L Charada

  • 1Service d'imagerie médicale, Hôpital Mahmoud Matri Ariana, Tunisie. oueslatiseddik@yahoo.fr

Annales D'Oto-Laryngologie Et De Chirurgie Cervico Faciale : Bulletin De La Societe D'Oto-Laryngologie Des Hopitaux De Paris
|November 8, 2006
PubMed
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Ectopic thyroid, thyroid tissue outside its normal location, can present as a basilingual mass. Imaging like scintigraphy and ultrasound are key for diagnosis, with CT and MRI aiding surgical planning.

Area of Science:

  • Endocrinology
  • Radiology
  • Embryology

Background:

  • Ectopic thyroid is thyroid tissue found outside its normal anatomical position, typically between the second and fourth tracheal cartilages.
  • This condition arises from developmental or migratory abnormalities during embryogenesis.
  • Preoperative imaging is crucial for evaluating ectopic thyroid presentations.

Observation:

  • A 13-year-old girl presented with dysphonia, throat fullness, and dyspnea.
  • A large mass was observed at the base of her tongue.
  • The mass was evaluated using ultrasound, CT, MRI, and scintigraphy.

Findings:

  • Ultrasound revealed a hypoechogenic mass at the tongue base.
  • Scintigraphy confirmed hyperfixation at the base of the tongue, with no uptake in the normal thyroid location.

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  • CT showed a hyperdense, enhancing basilingual mass, while MRI demonstrated characteristic signal intensities on T1 and T2 weighted images.

    • Implications:

    • Ectopic thyroid should be considered in cases of basilingual masses.
    • Scintigraphy and ultrasound are primary diagnostic tools for ectopic thyroid.
    • CT and MRI are increasingly important for diagnosis, assessing malignant potential, and surgical planning.