title: Unusual causes of tracheobronchial obstruction.
mesh_terms: D000293:Adolescent; D000368:Aged; D000402:Airway Obstruction / Q000209:etiology*; D001808:Blood Vessels / Q000002:abnormalities; D001980:Bronchi; D001982:Bronchial Diseases / Q000209:etiology*; D001984:Bronchial Neoplasms / Q000150:complications; D001999:Bronchoscopy; D002675:Child, Preschool; D004945:Esophagoscopy; D005260:Female; D005354:Fibrosarcoma / Q000150:complications; D005547:Foreign Bodies / Q000150:complications; D006801:Humans; D007223:Infant; D008297:Male; D011656:Pulmonary Emphysema / Q000150:complications; D014133:Tracheal Diseases / Q000209:etiology*