Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided pleural effusion has decreased since prior . Right basilar opacity is likely due to atelectasis , infection not excluded . Elsewhere , lungs are grossly clear . Cardiomediastinal silhouette is within normal limits . Median sternotomy wires and mediastinal clips are noted . Coils project over the right upper quadrant . No acute osseous abnormalities .
    OUTPUT:
    
Interval decrease in size of right pleural effusion which is now small . Right basilar opacity most likely atelectasis . Infection not entirely excluded .