Fig. 2

Contrast-enhanced computed tomography (CT) showing an atelectatic unilobe in the left lung (A, B). Three-dimensional CT image representing the tracheal trifurcation in three directions; the right main bronchus (blue arrow), blind-ended branch considered to be the left main bronchus (red arrow), and dorsal branch bifurcated to left lower lobe bronchus (green arrow) and the lower esophagus (yellow) (C)