FIG 1. TDCa in a 36-year-old man with an enlarging, painless right neck mass and a mass at the level of the hyoid bone.

A, Axial contrast-enhanced CT scan shows a 3 x 2.5-cm jugulodigastric node (arrow), which was shown by fine-needle aspiration to be papillary carcinoma.

B, More inferior CT section shows a solid soft-tissue mass at the level of the hyoid bone, slightly to the right of midline (arrow), representing the primary thyroglossal duct tumor. The thyroid gland was normally positioned.

FIG 2. A 53-year-old man presented with an enlarging midline neck mass. Axial contrast-enhanced CT scan shows both a cystic component containing a fluid-fluid level (arrowhead) and a large, irregular, invasive solid component (arrow). This was determined to be papillary carcinoma arising in a TDC.