Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to the prior examination dated ___ , the lung volumes are now slightly lower resulting in mild perihilar prominence . There is no lobar consolidation , large pleural effusion , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Low lung volumes without definitive evidence for pneumonia .