Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The small right apical pneumothorax noted on yesterday 's chest x-ray has decreased in size . There is a new right lung base opacity which is likely due to atelectasis . Additionally , the small to moderate left pleural effusion has increased in size . Stable cardiomegaly . Post-operative pneumopericardium has resolved . Median sternotomy wires and prosthetic aortic valve are unchanged in appearance .
    OUTPUT:
    
1 . Interval decrease in small right apical pneumothorax . 2 . New right lung base atelectasis . Slight worsening of left pleural effusion . Pneumopericardium resolved .