Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and aortic valve replacement . There is a left retrocardiac opacity , which likely reflects a pleural effusion with associated volume loss . The heart is stable and enlarged , and there is no overt pulmonary edema .
    OUTPUT:
    
Left retrocardiac retrocardiac opacity likely reflects pleural effusion with associated volume loss . A consolidation is not excluded in the appropriate clinical setting .