Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A hemodialysis catheter has been placed via a left - sided approach , with tip terminating in the lower superior vena cava near the junction with the right atrium . There is no visible pneumothorax . Pre-existing permanent pacemaker remains in place , unchanged . The cardiac silhouette is enlarged , and is accompanied by mild pulmonary vascular congestion . Moderate right pleural effusion has increased in size in the interval , but small left pleural effusion is similar . Persistent retrocardiac opacities , more confluent on the right than the left .
    OUTPUT:
    
1 . Mild CHF with enlarging moderate right pleural effusion . Unchanged small left pleural effusion . 2 . Persistent bilateral retrocardiac opacities , which may reflect atelectasis . Underlying pneumonia can not be excluded , particularly in the right lung base .