Clinical Presentation

A teenager with shortness of breath.

Further Work-up

(A,B) Frontal and lateral chest radiographs demonstrate a smooth, well-defined soft-tissue mass in the apex of the left hemithorax (arrows). (C) Axial post-contrast computed tomography (CT) image demonstrates that the smooth, homogeneous left apical mass has an attenuation value approximately equal to that of the subcutaneous adipose tissue (arrow).