Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . Mild pulmonary vascular congestion is present . Patchy opacities are seen in the lung bases , more pronounced on the left . No large pleural effusion or pneumothorax is identified . No acute osseous abnormalities are demonstrated .
    OUTPUT:
    
Patchy bibasilar airspace opacities likely reflect areas of atelectasis . Mild pulmonary vascular congestion .