Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior radiograph performed 1 .5 hours prior the moderate to large right pleural effusion is relatively unchanged in size allowing for differences in technique . A trace left pleural effusion is again identified . No pneumothorax is seen . There is moderate pulmonary vascular congestion , but no overt pulmonary edema . The mediastinal and cardiac contours are stable . A left pacer , median sternotomy wires and mediastinal clips are unchanged .
    OUTPUT:
    
Compared to the prior radiograph performed 1 .5 hours prior , the moderate to large right pleural effusion is relatively unchanged in size allowing for differences in technique . No pneumothorax .