Congenital laryngeal web

There is a congenital membrane in the larynx cavity, which is called congenital laryngeal web, and the larger one can occupy most of the larynx cavity. The cause is related to the abnormal development of the embryo. When the embryo is 30 mm, the closed epithelium of the acoustic glottis begins to absorb, and the duct is re-established. If the absorption is incomplete, the glottic congenital laryngeal web can be formed. The thickness of the laryngeal web is different. It is connective tissue with a few hair cell blood vessels and is covered with the laryngeal mucosal epithelium. Laryngeal webs are divided into three types: upper glottis, glottis, and subglottis. They occur more frequently in the glottis area, and rarely occur in the upper, lower, and posterior larynx.