Int J Thyroidol.  2020 Nov;13(2):181-186. 10.11106/ijt.2020.13.2.181.

A Case of Ectopic Thyroid Papillary Carcinoma with Incidental Papillary Thyroid Microcarcinoma

Affiliations
  • 1Department of Otolaryngology-Head and Neck Surgery, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea

Abstract

Ectopic thyroid is known to be a very rare disease. Its prevalence is 1 in 100,000-300,000, and it is the most common form of thyroid dysgenesis. In addition, it is known that primary thyroid cancer arising from ectopic thyroid tissue is rare. A 41-year-old male patient with mass in the anterior of the neck was admitted to our department of Otolaryngology. A surgical excision of the neck mass was carried out and the histopathology revealed papillary thyroid carcinoma. Total thyroidectomy and bilateral central neck dissection were then performed after 3 months from previous operation. As a result of histopathologic examination after surgery, we incidentally identified papillary microcarcinoma in the right thyroid lobe. We report a case of ectopic thyroid papillary carcinoma with incidental papillary thyroid microcarcinoma with a literature review.

Keyword

Ectopic thyroid; Ectopic thyroid carcinoma; Papillary thyroid carcinoma; Papillary thyroid microcarcinoma

Figure

  • Fig. 1 Profile photo. 1.5 cm sized movable, round mass in mid-anterior neck, thyroid cartilage level (black-lined circle).

  • Fig. 2 Computed tomography finding. A 1.3×1.0 cm sized lesion with mild enhancement under the thyroid cartilage (arrow).

  • Fig. 3 Ultrasound finding. (A) A 0.99×0.74 cm sized well-marginated hypoechoic lesion with no connection to thyroid isthmus. (B) Several small colloid cysts in the both thyroid gland, and no thyroid nodules suspected of malignancy. The nodule confirmed as papillary carcinoma as a result of histopathology after total thyroidectomy (arrows).

  • Fig. 4 Histopathologic finding (Hematoxylin and Eosin stain). (A) Proliferation of atypical formed of papillae with fibrovascular cores, suggests for papillary carcinoma with suspective locally minimal invasion in thyroid tissue. (B) Tall cell variant of papil-lary carcinoma (×100).

  • Fig. 5 Ultrasound finding. (A) 1 cm sized spongiform nodule in the left thyroid isthmus (arrow). (B) 1.2 cm sized isoechoic nodule with cystic change in right thyroid lower pole, confirmed benign by fine needle aspiration (arrow).


Reference

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