Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Aside from mild atelectasis of the lung bases the lungs are well expanded and clear . Heart size is normal . There is no pulmonary edema . Mediastinal and hilar contours are unremarkable . There is no large pleural effusion or pneumothorax . Multiple surgical clips project over the mediastinum . Median sternotomy wires appear grossly intact .
    OUTPUT:
    
No pulmonary edema . Mild bibasilar atelectasis similar to the prior study .