Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the most recent prior study , there is a new left basilar opacity obscuring the left heart border and left hemidiaphragm . Lucency in the bilateral lung apices is consistent with emphysematous change . No significant pleural effusion or pneumothorax is detected . The cardiac silhouette is top normal in size but unchanged . Mediastinal and hilar contours are within normal limits .
    OUTPUT:
    
New left basilar opacity may reflect underlying consolidation from infection or aspiration .