<prompt> Which is never a cause of thyroglossal fistula ?Infection of thyroglossal cystInadequate removal of thyroglossal cystCongenitalNone of the above  <response>: Ans. is c i.e., Congenital A thyroglossal duct cyst may rupture unexpectedly, resulting in a draining sinus known as a thyroglossal fistula. Thyroglossal fistula can develop when the removal of the cyst has not been fully completed. This is usually noticed when bleeding in the neck occurs, causing swelling and fluid ejection around the original wound of removal. 