Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right IJ line has been removed . There is no pneumothorax . Mediastinal surgical clips and sternotomy wires are in unchanged alignment . There is no focal opacity to suggest pneumonia . There are small bilateral pleural effusions which persist . Mild bibasilar atelectasis is also noted . However , overall aeration of the lungs is improved compared to two days prior .
    OUTPUT:
    
Improved aeration with overall increased lung volumes , though some basal atelectasis and small bilateral effusions persist .