Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is minimal bibasilar atelectasis . Otherwise , the lungs are free of focal consolidations , pleural effusions or pneumothorax . No evidence of pulmonary edema . Cardiomediastinal silhouette is within normal limits . Median sternotomy wires are unremarkable . A prosthetic aortic valve is re-demonstrated .
    OUTPUT:
    
Minimal bibasilar atelectasis . Otherwise , no acute cardiopulmonary process .