Abnormal bronchus morphology Airway casts 2022-01-31T04:50:28Z A replicate of airways from accumulated and condensed mucous and cellular material. These semisolid occlusions take the shape of the airway within they are formed, leading to obstruction of the tracheobronchial tree with consecutive respiratory insufficiency. Based on their principal composition, one can differentiate fibrin casts and mucin casts. Plastic bronchitis is the name of the condition characterized by the formation of airway casts. Casts are frequently (4-16%) observed in patients with congenital heart disease who have undergone Fontan palliation. Casts are infrequently observed in sickle cell disease-and acute chest syndrome, airway infections, in particular H1N1 influenza, severe asthma, or after smoke/chemical inhalation injuries.