Classification * Primary<unk>  * Secondary<unk>  Primary<unk>  * Primary<unk>  is classified as congenital. * Primary<unk>  is caused by a deficiency in the cartilaginous rings. * Primary airway malacia was defined as airway malacia in otherwise normal infants. Secondary<unk>  * Secondary<unk>  is acquired. * Secondary<unk>  may occur by extrinsic compression from an enlarged vessel, a vascular ring or a bronchogenic cyst. * Secondary airway malacia was defined as airway malacia secondary to esophageal atresia, VATER/VACTERL association (condition with vertebral anomalies, anal atresia, congenital heart disease, tracheoesophageal fistula or esophageal atresia, renourinary anomalies, or radial limb defects), vascular or other external compression of the airways, or specific syndromes.
Bronchomalacia
Tracheobronchomalacia
Malacia
Tracheomalacia
Tracheal tumor
Laryngomalacia
Bronchitis kettle
Croup