label: Tracheal cartilaginous sleeve
label_lc: tracheal cartilaginous sleeve
description: "Tracheal cartilaginous sleeve (TCS) is a rare congenital airway malformation in which distinct tracheal rings are replaced by a continuous cartilaginous segment. Vertically fused C- or O-shaped cartilaginous rings can extend from the subglottis to the carina or bronchus with little to no pars membranacea posteriorly. Comment:Tracheal cartilaginous sleeve has been associated with various craniosynostosis syndromes."