河口 政慎¹, 中村 みちる¹, 谷口 信行¹, 川井 俊郎², 伊東 紘一¹

Masanori KAWAGUCHI¹, Michiru NAKAMURA¹, Nobuyuki TANIGUCHI¹, Toshirou KAWAI², Kouichi ITOH¹

¹自治医科大学臨床検査医学, ²自治医科大学病理診断部

¹Departments of Clinical Laboratory Medicine, Jichi Medical School, ²Departments of Pathology, Jichi Medical School

キーワード : fine needle aspiration cytology, thyroid, neck mass, ultrasonography

We found a hyperechoic extrathyroidal mass incidentally on the right side of the neck during ultrasound examination. Fine needle aspiration cytology revealed follicular structures with no malignant pathological findings. ¹²³I scintigraphy confirmed our diagnosis of ectopic thyroid. The internal echo of the mass was exactly the same as that of the thyroid. Ectopic thyroid should be included in the differential diagnosis when a hyperechoic mass is found in the neck.