see: Thyroglossal Duct Cyst

see also:Thyroglossal Duct Cyst Excision

•  Also known as thyroglossal duct remnant

•  Most common congenital tongue base and neck lesion
•  7% on autopsy will be found to have cyst
•  Rarely associated with thyroid carcinoma of the cyst
•  Found between the foramen cecum of the tongue base and the infrahyoid thyroid bed
•  A midline cystic neck mass embedded in the infrahyoid strap muscles
•  Almost 50% are found at the level of the hyoid, with half of the remaining found above and half below
•  Usually 2-4 cm in diameter but can be smaller
•  On CT: benign appearing, low-density, occasionally septated, thin rim of peripheral enhancement with contrast, thicker rim if infected
•  On MR: can be hypo- or hyperintense on T1 depending on protein content; hyperintense on T2; rim-enhancing on T1 post-contrast if infected