Branchial fistula

Gill cleft fistula is generated when the gill sac is connected to the gill groove or the gill groove does not disappear. The external fistula of the branchial fistula and the entire fistula are located in the neck, so it is also called cervical fistula. The formation of branchial fistula is related to the following factors: ① rupture of the diaphragm between the gill groove and the gill sac; ② incomplete closure of the gill groove; ③ residual gill organ epithelium; One or more of the above factors may exist simultaneously.