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Sonographic Appearance of Focal Thyroiditis

¹ Department of Radiology, University of Pennsylvania Medical Center, 3400 Spruce St., Philadelphia, PA 19104.
² Prsent Address: Department of Medical Imaging, The Hospital for Sick Children, 555 University Ave., Toronto, Ontario M5G 1x8 Canada.
³ Department of Pathology, University of Pennsylvania Medical Center, Philadelphia, PA 19104.
⁴ Department of Medicine, University of Pennsylvania Medical Center, Philadelphia, PA 19104.

OBJECTIVE. The purpose of this study is to report the sonographic appearance of focal thyroid nodules that prove to be lymphocytic thyroiditis on fine-needle aspiration.

CONCLUSION. In a patient population undergoing sonography for palpable nodular disease without known thyroiditis, focal nodules of thyroiditis had a wide variety of appearances. They most commonly appeared as solid hyperechoic nodules with ill-defined margins. However, the echogenicity was variable, and calcification and cystic-appearing regions were also noted. The vascularity of these nodules as assessed with color Doppler and power Doppler sonography also varied widely. Biopsy of these lesions is still necessary because there are no sonographic features that can reliably diagnose these lesions as thyroiditis and differentiate them from other lesions.

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