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Updated: Mar 19, 2026

An Orthotopic Mouse Model of Anaplastic Thyroid Carcinoma
Published on: April 17, 2013
An accessory thyroid gland that presented tumor-like images
Nobuyuki Takemoto1, Ai Koyanagi2, Junko Koike3
1Department of Breast and Endocrine Surgery, Japan Medical Alliance Higashi Saitama General Hospital, 5-517 Yoshino, Satte, Saitama, 340-0153, Japan. n_takemoto@shogo.com.
A neck mass was diagnosed as an accessory thyroid gland, not a thyroid nodule. This highlights the importance of considering accessory thyroid tissue in neck mass diagnoses.
Area of Science:
- Endocrinology
- Surgical Pathology
Background:
- Neck masses can present diagnostic challenges.
- Differentiating ectopic thyroid tissue from other neck masses is crucial for appropriate management.
Purpose of the Study:
- To report a case of an accessory thyroid gland presenting as a neck mass.
- To emphasize the diagnostic considerations for ectopic thyroid tissue.
Main Methods:
- Case presentation of a 26-year-old woman with a neck mass.
- Diagnostic imaging including ultrasonography, computed tomography, and magnetic resonance imaging.
- Surgical resection and subsequent pathological examination.
Main Results:
- A 3 cm dumbbell-shaped neck mass was identified incidentally.
- Imaging revealed a mass distinct from the thyroid gland, compressing the right thyroid lobe.
- Pathological examination confirmed normal thyroid gland tissue, diagnosing an accessory thyroid gland.
Conclusions:
- Accessory thyroid glands can mimic other neck pathologies.
- Consider accessory thyroid tissue in the differential diagnosis of neck masses near the thyroid gland.
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