The radiographic appearances of the larynx on the chest radiograph.

100 chest radiographs were reviewed for the normal variable appearances of the larynx. Five radiographs were underexposed and on the remaining 95, contrast between air and soft tissue was identifiable. On 55 radiographs the glottis could be identified, of which 46 had both, eight had none and one had one pyriform recess filled with air. 40 chest radiographs were below the level of the glottis, 34 of which had a convergent appearance of the subglottic region and six had a parallel appearance of the tracheal walls. Appreciation of the variable appearances of the larynx on chest radiography is important before attempting to diagnose laryngeal disease, where practicable standard laryngeal views are recommended.