Histopathology of congenital subglottic stenosis.

Three patients with congenital subglottic stenosis are presented and whole organ serial-section studies of their larynges are discussed. A superiorly displaced first tracheal ring is observed to form a cartilaginous subglottic stenosis in one. This "trapped first ring" is demonstrated in horizontal, sagittal and coronal planes. Subglottic stenosis is a clinical diagnosis which describes multifarious histopathological forms of narrowing within the subglottic larynx.