Figure 1. Case 1.(a) Anteroposterior and (b) lateral views of the three-dimensional (3D) reconstruction CT, obtained 4 days before balloon dilation, show a 6 cm long tracheal stenosis (arrowheads in (a) and (b)) from the mid-trachea to the carina and a 1.5 cm long right main bronchial stenosis (arrows in (a)).