Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right central venous catheter courses to the level of the cavoatrial junction . Heart is not enlarged . Aorta is unfolded . No overt CHF . Although the retrocardiac consolidation has improved from ___ , a retrocardiac opacity persists with air bronchograms . Otherwise , no focal infiltrate or consolidation identified . Left pleural effusion has resolved . No right pleural effusion is seen . No pneumothorax .
    OUTPUT:
    
Interval improvement in previously seen retrocardiac consolidation , though some degree of retrocardiac opacity persists , which could reflect pneumonia in the correct clinical setting . No new infiltrate identified . Interval resolution of left pleural effusion .