Gill cleft fistula and operculum fistula cyst are congenital malformations of the lateral neck. These are common surgical cases of the head - neck - face. The purpose of surgery for operculum fistula is to remove the entire fistula tract.

Branchial cleft disease is known as one of the common congenital diseases in children, accounting for about 30% of congenital tumors appearing in the neck area. Surgery to remove branchial cleft cysts is currently the only treatment method for branchial cleft cysts.