Endocrine Journal
Online ISSN : 1348-4540
Print ISSN : 0918-8959
ISSN-L : 0918-8959
NOTE
A Case of Malignant Thymoma Mimicking Thyroid Carcinoma: A Pitfall in Fine-needle Aspiration
Bunzo MATSUURAHitoo TOKUNAGATeruki MIYAKESachiko UTSUNOMIYAHisaka MINAMIMorikazu ONJI
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2004 Volume 51 Issue 2 Pages 237-241

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Abstract

A case of malignant thymoma presenting as an anterior neck mass is reported. The tumor extended from the thyroid gland to the superior mediastinum. It did not accumulate Tc-99m pertechnetate, but continued to accumulate Tl-201 at the late phase. A fine-needle aspiration cytology from the tumor showed tight clusters of epithelial cells with crowded ovoid nuclei. The tumor was initially diagnosed as thyroid carcinoma, clinically and cytologically. A thymoma with a dominant epithelial component has to be considered in the differential diagnosis of a suspected papillary carcinoma of the thyroid.

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© The Japan Endocrine Society
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