A CHARACTERISTIC PULMONARY FINDING IN UNILATERAL COMPLETE BRONCHIAL TRANSECTION

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Abstract
A corroborative case of traumatic complete transection of the right upper lobe and intermediate bronchi is reported. As in the previously reported case, the lung fell away from the mediastinum toward the most dependent portion of the thorax. In the upright roentgenogram, the superior margin of the collapsed right lung lay below the level of the transected bronchi. In an uncomplicated pneumothorax, the superior border of the collapsed lung must remain above the level of the main-stem bronchus. The previously reported findings in traumatic transection of a main bronchus are all indirect. The "falling lung" sign gives direct evidence for traumatic transection of the bronchus.

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