Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged . The mediastinal and hilar contours are unremarkable . Mild pulmonary vascular congestion is demonstrated without overt pulmonary edema . Patchy opacities within the right lung base may reflect atelectasis . Infection is not excluded . No large pleural effusion or pneumothorax is present . No acute osseous abnormality is identified .
    OUTPUT:
    
Patchy right basilar opacity may reflect atelectasis but infection can not be completely excluded .