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Heterotopic intrathymic thyroid tissue.

Ilseon Hwang1, Seung-Koo Lee, Kyung-Ja Cho

  • 1Department of Pathology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.

Pathology International
|September 21, 2006
PubMed
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Heterotopic intrathymic thyroid tissue is rare but can mimic metastatic papillary thyroid carcinoma. Histological analysis confirmed benign intrathymic thyroid tissue, distinct from the patient's papillary thyroid carcinoma.

Area of Science:

  • Pathology
  • Endocrinology
  • Surgical Oncology

Background:

  • Heterotopic intrathymic thyroid tissue is exceptionally rare.
  • Distinguishing it from metastatic thyroid carcinoma is crucial due to histological similarities.

Observation:

  • A case of incidentally identified heterotopic intrathymic thyroid tissue in a patient with papillary thyroid carcinoma is presented.
  • Histological examination of a radical neck dissection specimen revealed this rare finding.

Findings:

  • Intrathymic thyroid follicles showed benign histological features, identical to normal thyroid tissue.
  • Follicular cells exhibited a low Ki-67 index and were negative for galectin-3, HBME-1, and RET oncoprotein.
  • These markers contrasted with the primary papillary thyroid carcinoma cells.

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Implications:

  • This case highlights the diagnostic challenge posed by heterotopic intrathymic thyroid tissue.
  • Accurate differentiation from metastatic carcinoma is essential for appropriate patient management.
  • This report is the first to describe this diagnostic difficulty in a papillary thyroid carcinoma patient.