In 1922, Sicard and Forestier1 published their first article on the visualization of the tracheobronchial tree by the use of iodized oil 40 per cent (lipiodol). At the present time numerous articles may be found in the literature attesting to the popularity and value of this procedure. Visualization of the bronchi by use of radiopaque mediums had, however, been accomplished earlier in attempts to visualize the esophagus or the stomach. The medium was aspirated, or it entered the bronchus through a tracheo-esophageal fistula, and thus the bronchus was outlined.
The first definitely successful attempt to outline the tracheobronchial tree should be credited to Jackson.2 In 1918, he reported that dry bismuth subcarbonate insufflated through a bronchoscope is useful in mapping out the tracheobronchial tree in cases in which a foreign body is present far in the upper lobe of the bronchus. He had used this method in
DAVIS JD. ANATOMIC VARIATIONS OF THE NORMAL TRACHEOBRONCHIAL TREE. Arch Otolaryngol. 1929;9(4):404–413. doi:10.1001/archotol.1929.00620030426005
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