Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart continues to be moderately enlarged . There is small amount of pneumomediastinum consistent with recent pericardial window . There are bilateral effusions left greater than right which are small to moderate size . There is dense retrocardiac opacity has increased compared to the prior study . there is mild pulmonary vascular redistribution and areas of linear opacity in the left lung laterally which likely due to linear atelectasis but attention should be paid to this region on followup .
    OUTPUT:
    
Postoperative changes and fluid overload .