Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is unchanged , and within normal limits . The mediastinal and hilar contours are stable , with rightward shift of mediastinal structures which is chronic . Volume loss in the right lung is unchanged , with increased interstitial opacities in lung bases , slightly progressed from the prior study . The pulmonary vascularity is not engorged . Small right pleural effusion is likely present . No new definite focal consolidation or pneumothorax is seen .
    OUTPUT:
    
Increased interstitial opacities in the lung bases , slightly worse when compared to the prior study , which may represent superimposed bibasilar atelectasis on a background of chronic interstitial lung disease . No pulmonary edema is noted .