Obstruction of pulmonary airway.
D001249:Asthma / Q000000981:diagnostic imaging; D001999:Bronchoscopy; D002675:Child, Preschool; D003937:Diagnosis, Differential; D005547:Foreign Bodies / Q000000981:diagnostic imaging; D006801:Humans; D001261:Pulmonary Atelectasis / Q000000981:diagnostic imaging*; D011859:Radiography; D012140:Respiratory Tract Diseases / Q000000981:diagnostic imaging*