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Papillary carcinoma in an ectopic thyroid.

A Zink1, F Raue, R Hoffmann

  • 1Department of Internal Medicine I, University of Heidelberg, FRG.

Hormone Research
|January 1, 1991
PubMed
Summary
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This study reports the first documented case of papillary carcinoma in non-lingual ectopic thyroid tissue, occurring without a normally located thyroid gland. This rare finding highlights the potential for malignancy in ectopic thyroid tissue.

Area of Science:

  • Endocrinology
  • Surgical Pathology

Background:

  • Ectopic thyroid tissue, thyroid tissue found outside its normal location, can occur anywhere from the foramen caecum to the lower neck.
  • While often presenting as a thyroglossal duct cyst, total ectopia, such as lingual thyroid, is less common.
  • Malignant transformation within ectopic thyroid tissue is exceptionally rare.

Observation:

  • This report details a unique case of papillary carcinoma arising in non-lingual ectopic thyroid tissue.
  • Crucially, this ectopic thyroid carcinoma was diagnosed in the absence of any orthotopic (normally located) thyroid gland.
  • Previous literature documented only 21 cases of lingual thyroid carcinomas by 1971.

Findings:

  • The presented case represents the first documented instance of papillary carcinoma in a non-lingual ectopic thyroid.

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  • The absence of an orthotopic thyroid gland in this patient further distinguishes this case.
  • This finding expands the known spectrum of ectopic thyroid pathologies.

    • Implications:

    • This case underscores the importance of considering malignancy in ectopic thyroid tissue, even in rare locations.
    • It suggests that ectopic thyroid tissue, regardless of location or presence of an orthotopic gland, can undergo malignant transformation.
    • Further research may be warranted to understand the specific oncogenesis and clinical behavior of carcinomas in non-lingual ectopic thyroid tissue.