Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is a right IJ Swan - Ganz catheter , with tip overlying the proximal right pulmonary artery . There has been slight interval clearing of opacity at the left base and possible slight overall improvement in CHF findings . The cardiomediastinal silhouette is similar to the prior film . Probable small right effusion , unchanged .
    OUTPUT:
    
As above . .