Neck masses are frequently encountered in children. Although they are most often due to past infections, they may be of congenital origin. A neck mass in an adult may also be benign and of congenital origin. Common congenital neck masses include thyroglossal duct cysts, branchial anomalies, cystic hygromas and hemangiomas. Cysts, sinuses and fistulas may arise from the branchial apparatus.