Her mother says that this mass appeared 6 months ago and is increasing in size. There is no pain or discomfort. On examination , the mass is is the midline, inferior to the hyoid bone. Laboratory test reveal normal thyroid panel. Surgery was recommended after a CT scan is performed.
What is the most likely diagnosis?
A, Dermoid cyst
B. Ectopic thyroid gland
D. Thyroglossal duct cyst
E. Branchial cleft cyst.
Answer And Discussion:
D Thyroglossal duct cyst
Normally Thyroglossal duct cyst disappears during development of thyroid gland but in some cases the duct remains in the neck and forms a cyst. It appears in the midline of the neck and is painless. Surgery is recommended to prevent infection if the CT scan shows a normal thyroid gland and thyroglossal duct cyst attached to it. All other options are possible causes but they are less common than the thyroglossal duct cyst.