Which is never a cause of thyroglossal fistula -

• A thyroglossal fistula usually presents as discharging sinus in the midline of the neck in the line of thyroid descent. • It is never congenital but follows infection or inadequate removal of a thyroglossal cyst • Acquired condition Clinical Features • Presentation is with a fistulous opening near to the midline of the neck • The fistula may become infected and discharge pus Treatment • The fistula should be excised along with the thyroglossal tract upto the base of the tongue. • This requires removing the central (middle one third) of the hyoid bone.