Figure 1: (a) Chest X-ray of the infant at presentation. Note the large, well-defined radiopaque mass at the upper mediastinum (big white arrows) dislocates the trachea (small white arrows) to the left. (b) Coronal T2-weighted HASTE (half fourier-acquired single shot turbo spin echo) image showing thymic enlargement (white arrows). (c) Sagittal T2-weighted BLADE/PROPELLER (periodically rotated overlapping parallel lines with enhanced reconstruction) image with a respiratory compensation technique for motion correction showing retrosternal distension (white arrows). (d) Chest X-ray of the infant 2 months after therapy. No dislocation of the trachea (white arrows) could be observed.