Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Patchy densities in the lung bases are less prominent compared to the prior exam . No focal consolidation to suggest focal pneumonia . No pleural effusion , pneumothorax , or edema . The cardiomediastinal silhouette is overall unchanged .
    OUTPUT:
    
No acute cardiopulmonary process .