Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . The lungs are clear of focal consolidation . Focal opacity which silhouettes mid left cardiac border is compatible with epicardial fat pad seen on prior CT scan . There is abnormal contour with ___ contour in the region of the AP window just inferior to the aortic knob . The cardiomediastinal silhouette is otherwise notable for an ectatic descending thoracic aorta . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process . Abnormal contour in the region of the AP window which appears in continuity with the descending thoracic aorta . Dedicated chest CT is suggested to further characterize .