Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . Mild pulmonary edema has worsened throughout the lungs and greater opacification at the lung bases could be atelectasis or coalescent edema . No focal consolidation or pneumothorax . Prosthetic aortic valve is present .
    OUTPUT:
    
Mild pulmonary edema has worsened throughout the lungs and greater opacification at the lung bases could be atelectasis or coalescent edema .