Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to chest radiograph approximately 14 hours prior , there are no significant appreciable changes . Severe upper lobe predominant emphysema is redemonstrated . There are no new focal lung consolidations concerning for pneumonia . The cardiopulmonary silhouette and hilar contours are stable . The curvilinear density at the lower heart contour representing pericardial calcification is unchanged . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
No findings to suggest pneumonia and no appreciable changes compared to chest radiograph 14 hours prior .