Conclusions: The thyroglossal duct cyst must be studied in the adult population through fine-needle aspiration biopsy (FNAB) and a frozen section in cases in which FNAB is inconclusive or unavailable.

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 ...