Figure 42.

The right bronchus takes an angle of about 45° from midline as it proceeds toward the hilum of the left lung (dotted yellow arrow). It is seen in the subcarinal window anterior to the esophagus and can be traced from the lower margin of the trachea with clockwise rotation. As the scope is rotated clockwise, the left bronchus proceeds in an angle of about 45° from midline and in this case is seen as multiple interrupted rings (small orange arrows). The subcarinal space is the entire space between the probe and the left bronchus