Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Rotated positioning . Compared with ___ , there has been some interval clearing at both bases , with decreased retrocardiac opacity and renewed visualization of the left hemidiaphragm . Air bronchograms at the right base have also resolved . Small residual left - greater - than - right patchy opacity remains visible . Previously seen vascular blurring , consistent with mild CHF , has resolved . Enlarged cardiomediastinal silhouette , with sternotomy wires and prosthetic valve again noted , unchanged .
    OUTPUT:
    
Interval improvement of opacities at both bases and interval improvement of CHF findings .