Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Comparison is made to prior study from ___ at 8 : 26 a .m . There is unchanged cardiomegaly . There is mild improvement of the pulmonary edema since the previous study . There is a right - sided central line with distal lead tip at the cavoatrial junction . There are no pneumothoraces . There is a persistent left retrocardiac opacity which may be due to the atelectasis , pleural fluid , or focal consolidation .
    OUTPUT:
    
Improvement of the pulmonary interstitial markings .