Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is prominent , but likely accentuated by AP technique . Mediastinal and hilar contours are within normal limits . There is mild unfolding of the thoracic aorta with arch calcifications . Rightward displacement of the trachea is unchanged since multiple prior exams . There is mild perihilar vascular engorgement without frank edema . There may be segmental atelectasis in the left base , and a small left effusion can not be excluded . A moderate hiatal hernia is present .
    OUTPUT:
    
1 . Mild perihilar vascular engorgement without frank edema . 2 . Moderate hiatal hernia .