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Published in: Diagnostic Pathology 1/2021

Open Access 01-12-2021 | Foreign Body Aspiration | Case Report

Diagnostic pitfall of thyroid fine-needle aspiration induced fibrosis: follicular adenoma mimicking medullary thyroid carcinoma in frozen section

Authors: Woo Sung Moon, Myoung Jae Kang, Hyun Jo Youn, Kyoung Min Kim

Published in: Diagnostic Pathology | Issue 1/2021

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Abstract

Background

Fine-needle aspiration (FNA) is a frequently utilized method for the diagnosis of thyroid nodules. Although the technique has clear advantages, the injury caused by the aspiration needle can induce various histological alterations. Herein, we report a case of follicular adenoma showing histological alterations possibly caused by FNA biopsy. Furthermore, the histological appearance of the lesion mimicked those of medullary thyroid carcinoma, particularly in the frozen section.

Case presentation

Ultrasonography of a thyroid nodule in a 39-year-old man revealed a mass (2.2 cm in diameter) in the right thyroid lobe. FNA was performed three times on the mass, and the results of the cytology were atypia of undetermined significance. Thereafter, the patient underwent right hemithyroidectomy. The histological findings of the operative frozen section analysis indicated medullary thyroid carcinoma. However, after evaluation and immunohistochemical staining of the permanent section, the mass was diagnosed as follicular adenoma with extensive fibrosis.

Conclusion

The histological alterations observed in the follicular adenoma are believed to have been caused by injury during the repeated FNA procedures.
Literature
1.
go back to reference Gharib H, Papini E, Paschke R, et al. American Association of Clinical Endocrinologists, Associazione Medici Endocrinologi, and European Thyroid Association medical guidelines for clinical practice for the diagnosis and management of thyroid nodules. Endocr Pract. 2010;16(Supplement 1):1–43.CrossRef Gharib H, Papini E, Paschke R, et al. American Association of Clinical Endocrinologists, Associazione Medici Endocrinologi, and European Thyroid Association medical guidelines for clinical practice for the diagnosis and management of thyroid nodules. Endocr Pract. 2010;16(Supplement 1):1–43.CrossRef
2.
go back to reference Cooper D, Doherty G, Haugen B, et al. American Thyroid Association (ATA) guidelines taskforce on thyroid nodules and differentiated thyroid cancer. Revised American Thyroid Association management guidelines for patients with thyroid nodules and differentiated thyroid cancer. Thyroid. 2009;19(11):1167–214. https://doi.org/10.1089/thy.2009.0110.CrossRefPubMed Cooper D, Doherty G, Haugen B, et al. American Thyroid Association (ATA) guidelines taskforce on thyroid nodules and differentiated thyroid cancer. Revised American Thyroid Association management guidelines for patients with thyroid nodules and differentiated thyroid cancer. Thyroid. 2009;19(11):1167–214. https://​doi.​org/​10.​1089/​thy.​2009.​0110.CrossRefPubMed
7.
go back to reference LiVolsi VA, Merino MJ. Worrisome histologic alterations following fine-needle aspiration of the thyroid (WHAFFT). Pathol Annu. 1994;29:99–120.PubMed LiVolsi VA, Merino MJ. Worrisome histologic alterations following fine-needle aspiration of the thyroid (WHAFFT). Pathol Annu. 1994;29:99–120.PubMed
9.
go back to reference Lloyd RV, Kovacs K, Young W Jr, et al. World Health Organisation classification of tumours; 2004. p. 10–3. Lloyd RV, Kovacs K, Young W Jr, et al. World Health Organisation classification of tumours; 2004. p. 10–3.
Metadata
Title
Diagnostic pitfall of thyroid fine-needle aspiration induced fibrosis: follicular adenoma mimicking medullary thyroid carcinoma in frozen section
Authors
Woo Sung Moon
Myoung Jae Kang
Hyun Jo Youn
Kyoung Min Kim
Publication date
01-12-2021
Publisher
BioMed Central
Published in
Diagnostic Pathology / Issue 1/2021
Electronic ISSN: 1746-1596
DOI
https://doi.org/10.1186/s13000-021-01087-2

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