Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The mediastinal and hilar contours are unremarkable . There is mild pulmonary vascular engorgement without frank edema . Patchy opacities in the lung bases may reflect atelectasis , but early infection can not be excluded . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy opacities in lung bases may reflect atelectasis , but early infection can not be excluded . Mild pulmonary vascular congestion .