When a thyroglossal duct cyst FNAB is diagnostic for carcinoma, a thyroid ultrasound must be performed in order to rule out the presence of thyroid disease. Likewise, if a non-diagnostic FNAB is ...

to detect any abnormalities within the TGDC, and to identify the presence of the thyroid gland. The presence or absence of a solid component within the cyst may also be evaluated preoperatively.