Imaging Findings

(A–C) Computed tomography (CT) of the chest after administration of oral contrast (A) shows a large parenchymal opacity with central cavitation and an air-fluid level in the right lower lobe with an accumulation of oral contrast (arrow, A). An abnormal soft-tissue mass is noted between the esophagus, posterior aspect of the left atrium, and descending thoracic aorta, better appreciated on the contrast-enhanced images (arrows, B, C).

  Differential Diagnosis