Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , a moderate right pleural effusion and small left pleural effusion persists . Bibasilar atelectasis is improved since ___ , appearing mild on the left and moderate on the right . Lungs are better aerated since ___ . The heart size is unchanged . Median sternotomy wires are intact and aligned . Note is made of a replaced mitral valve . There has been interval removal of a right internal jugular introducer . No pneumothorax .
    OUTPUT:
    
1 . Moderate right pleural effusion and small left pleural persists , and bibasilar atelectasis , right greater than left , is improved since ___ .