Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lines and tubes are similar to the prior film . No pneumothorax is detected . There are low inspiratory volumes , with increased retrocardiac density and atelectasis at the right base . Mild vascular plethora is similar to the prior film doubt overt CHF . The cardiomediastinal silhouette is also similar in appearance .
    OUTPUT:
    
As above . .