Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . Since the prior exam , mild pulmonary edema has increased . A small right pleural effusion is not significantly changed . There is persistent retrocardiac opacification , which given the chronicity is likely atelectasis , and less likely pneumonia . No new opacities are identified . There is no pneumothorax . The cardiomediastinal silhouette is moderately enlarged , and unchanged . A right - sided hemodialysis catheter in stable position with the tip in the right atrium .
    OUTPUT:
    
1 . Increase in mild pulmonary edema . Stable small right pleural effusion . 2 . Unchanged retrocardiac opacity , which given the chronicity is likely atelectasis and less likely pneumonia . No new opacities are identified .