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Thyroglossal duct cysts are the most common congenital neck mass, arising from remnants of the embryonic thyroglossal duct that normally disappears during fetal development. Branchial cleft anomalies result from incomplete obliteration of the embryonic branchial apparatus, presenting as cysts, sinuses, or fistulas along the lateral neck.
Thyroglossal duct cysts develop when portions of the thyroglossal duct fail to involute completely during the 7th-10th weeks of gestation, creating fluid-filled cysts anywhere along the duct's path from the tongue base to the thyroid gland. Branchial cleft anomalies occur when the branchial pouches, clefts, or arches fail to develop properly during the 6th week of embryogenesis, with second branchial cleft anomalies being most common.
Thyroglossal duct cysts typically present as midline neck masses that move with swallowing and tongue protrusion, often becoming apparent after upper respiratory infections when they enlarge due to inflammation. Branchial cleft cysts usually present as lateral neck masses along the anterior border of the sternocleidomastoid muscle, while fistulas may have external openings with intermittent drainage, requiring imaging studies and surgical consultation for definitive management.