Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with ___ : 30 , there is improved aeration of the left upper zone . The large left effusion seen on the most recent prior film has decreased in size , though remains quite large . As before , there is underlying left lung collapse and / or consolidation . However , the cardiomediastinal silhouette is now restored to midline . Upper zone vessels on the left are prominent , likely related to compressive atelectasis . On the right , there is a rind of increased opacity as well as increased interstitial markings the right lung apex , unchanged . There is hazy opacity at the right lung base , likely reflecting a combination of a small pleural effusion and underlying atelectasis , similar to the prior study . A thin catheter other tubing overlies the right lung , unchanged . Doubt CHF on the right . No pneumothorax detected on either side . Indwelling right subclavian catheter tip adjacent to SVC / RA junction , unchanged .
    OUTPUT:
    
1 . Interval restoration of aeration at the left upper zone , with residual opacification of the mid and lower zones of the left long . This likely reflects a large residual left pleural effusion with underlying collapse and / or consolidation . 2 . Cardiomediastinal silhouette now midline . 3 . Findings in the right lung are similar to prior . Right - sided catheter noted .