Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest are compared to previous exam from ___ . The lungs are hyperinflated . Best seen on the lateral view is a new increased density projecting over the spine , which is not clearly seen on the frontal view . Elsewhere , the lungs are clear . Cardiac silhouette is enlarged but stable . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
Apparent development of retrocardiac opacity only on the lateral view . This could potentially represent atelectasis given slightly lower inspiratory effort on the current lateral film and when compared to the frontal view . However , developing consolidation is not completely excluded . Clinical correlation recommended .