A laryngo-tracheo-esophageal cleft (LC) is a congenital malformation characterized by an abnormal, posterior, sagittal communication between the larynx and the pharynx, possibly extending downward between the trachea and the esophagus. The disease is laryngotracheoesophageal cleft (MONDO_0016060, a Monarch Disease Ontology entry). Also known as: LC, LTEC, Larnygeotracheoesophageal cleft, congenital cleft larynx, laryngeal cleft, laryngo-tracheo-esophageal cleft, laryngo-tracheo-esophageal diastema, tracheal cleft.