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