Congenital laryngeal (glottic) webs are uncommon, membrane-like structures that extend across the laryngeal lumen near the level of the vocal cords. They are thought to result from incomplete resorption of an epithelial layer that normally obliterates the developing laryngeal opening at about the sixth week of embryologic life. This layer is usually completely eliminated by the tenth week. Most laryngeal webs occur at the glottic level and affect the vocal cords. More than 90% are located anteriorly and extend toward the arytenoids. While affected persons may have onset of manifestations at any age, with hoarse or weak voice and frequent upper respiratory infections, they usually manifest the condition as infants, with respiratory distress, stridor, and an unusual cry (Strakowski et al., 1988; Singh et al., 2009). [from
OMIM]