Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study , the left pleural effusion is probably slightly larger . Again seen is patchy retrocardiac opacity , which may also be slightly more pronounced . There is also slight left perihilar atelectasis . Again seen is a small right pleural effusion which may be slightly improved . Minimal atelectasis in the right infrahilar region is improved . Right lung is otherwise grossly clear , without CHF or focal infiltrate . Cardiomediastinal silhouette is probably unchanged , though partially obscured on the left . Sternotomy wires again noted . No pneumothorax detected .
    OUTPUT:
    
Patchy retrocardiac opacity and small to moderate left pleural effusion are slightly more pronounced . Patchy left perihilar opacity is also more pronounced , question due to atelectasis . Small right pleural effusion and right base atelectasis may be slightly improved .