Clin Ultrasound.  2021 Nov;6(2):63-66. 10.18525/cu.2021.6.2.63.

Metastatic Clear Cell Renal Carcinoma with Benign Ultrasonographic Findings in the Thyroid Gland

• Yi W
• Kim BH
• Kim JM
• Kim YK

• KMID: 2555136
• DOI: http://doi.org/10.18525/cu.2021.6.2.63

Abstract

Metastasis to the thyroid gland is rare, and the incidence of thyroid metastasis is from 1.4% to 3% for all thyroid malignancies. The most common metastatic malignancy to the thyroid gland is renal cell carcinoma. Ultrasonography is useful to assess the malignancy risk of thyroid nodules, and the ultrasonographic features of metastatic renal cell carcinoma in the thyroid gland are hypoechoic solid nodules with increased vascularity. Here, we report a case of metastatic clear cell renal carcinoma with benign ultrasonographic features and fine-needle aspiration cytology in the thyroid gland. A 76-year-old woman visited our hospital for surgical management of a growing left thyroid mass. Her history comprised previous left nephrectomy for an unknown reason. Thyroid ultrasonography revealed a well-defined, isoechoic, solid mass. Left thyroidectomy was performed, and the final diagnosis was metastatic clear cell renal carcinoma of the thyroid gland.

Keyword

신세포암; 전이; 갑상선; 초음파; Renal cell carcinoma; Metastasis; Thyroid; Ultrasonography