Imaging Findings

(A, B) Contrast-enhanced thoracic computed tomography (CT). Axial (A) and sagittal (B) re-formations demonstrate a low-density mass with a cystic appearance in the subcarinal region (arrows, A) that has a mild mass effect on the esophagus, which is seen between the aorta and the cystic mass (arrow, B).

  Differential Diagnosis