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Atypical Thyroiditis Following Influenza B Infection
Int J Thyroidol 2017;10(1):42-45
Published online May 30, 2017;  https://doi.org/10.11106/ijt.2017.10.1.42
© 2017 Korean Thyroid Association.

Tae Yang Yu1, Jae Hoon Lee2, Hun Soo Kim3, Ha-Young Kim4 and Chung Gu Cho1

Division of Endocrinology and Metabolism, Department of Medicine, Wonkwang University School of Medicine1, Department of Medicine, Wonkwang University School of Medicine2, Department of Pathology, Wonkwang University School of Medicine3, Iksan, Division of Endocrinology and Metabolism, Department of Medicine, Wonkwang University Sanbon Hospital4, Gunpo, Korea
Correspondence to: Chung Gu Cho, MD, PhD, Division of Endocrinology and Metabolism, Department of Medicine, Wonkwang University Hospital, 895 Muwang-ro, Iksan 54538, Korea
Tel: 82-63-859-2670, Fax: 82-63-855-2025, E-mail: cgchomd@naver.com
Received October 20, 2016; Revised January 12, 2017; Accepted February 24, 2017.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Viral infections are known to be a predisposing factor for subacute (De Quervain’s) thyroiditis. In this report, we document a novel case of thyroiditis, with an atypical presentation, following an influenza B infection. A 13-year-old previously healthy female visited the outpatient clinic complaining of right neck pain. She had been diagnosed with an influenza B infection at a local clinic 3 weeks earlier. All laboratory tests were normal. A thyroid ultrasound showed an ill-defined hypoechoic mass (1.0×0.5×1.5 cm) in the right lower thyroid, and scintigraphy of the thyroid with Technetium-99m (99m-Tc) demonstrated the normal uptake of the radiotracer. Fine-needle aspiration from the nodule showed the presence of a few neutrophils. To the best of our knowledge, this is the first case of atypical thyroiditis associated with an influenza B infection described in the literature. Influenza B infection should be considered as a possible cause of atypical thyroiditis.
Keywords : Influenza B, Infection, Thyroiditis