Thyroglossal duct cyst is one of the most frequent midline cervical mass. It is congenital in origin, and resulting from retention of an epithelial tract between the thyroid gland and the foramen cecum linguae. Starting at the foramen cecum, the thyroglossal tract passes down in the midline ; first, through the tongue mucsculature and then, around the hyoid bone and larynx, before ending at the thyroid isthmus on the trachea. Remnants may occur at any point along this pathway, and its fistula results from spontaneous rupture of cyst due to inflammation, surgical drainage of the cyst, or inadequate excision. One hundred cases of thyroglossal duct cyst who had been admitted to Hanyang University Hospital from June 1985 to May 1994 were analysed clinically.