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Clinics in diagnostic imaging (101): Multinodular accessory thyroid tissue.

P S Richards1, A T Ahuja, A D King

  • 1Department of Diagnostic Radiology and Organ Imaging, Faculty of Medicine, The Chinese University of Hong Kong, Prince of Wales Hospital, Ngan Shing Street, Shatin, New Territories, Hong Kong SAR, China. pollyrichards@doctors.org.uk

Singapore Medical Journal
|October 29, 2004
PubMed
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A woman with a family history of thyroid cancer was diagnosed with rectal carcinoid tumor and a submental mass. Further investigation confirmed the submental mass as multinodular accessory thyroid tissue, not metastasis.

Area of Science:

  • Endocrinology
  • Oncology
  • Surgical Pathology

Background:

  • A 71-year-old woman with a significant family history of thyroid cancer presented with gastrointestinal symptoms.
  • Colonoscopy revealed a rectal carcinoid tumor, prompting further investigation into other potential concurrent conditions.

Observation:

  • Physical examination identified a large goiter and a firm submental mass.
  • The differential diagnosis for the submental mass included accessory thyroid tissue versus metastatic carcinoma.

Findings:

  • Staging computed tomography (CT) and subsequent ultrasonography with aspiration biopsy confirmed the submental mass as multinodular accessory thyroid tissue.
  • The presence of both a rectal carcinoid tumor and accessory thyroid tissue in the same patient is noteworthy.

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Implications:

  • This case highlights the importance of a comprehensive differential diagnosis when evaluating neck masses, especially in patients with a history of endocrine disorders or cancer.
  • Understanding the distinct etiologies of accessory thyroid tissue and ectopic thyroid glands is crucial for accurate diagnosis and management.
  • Further research into the potential association between carcinoid tumors and thyroid abnormalities may be warranted.