Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . Aortic knob is calcified . The mediastinal contour is unremarkable . There is mild pulmonary vascular congestion . Patchy opacities in the lung bases may reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . No acute osseous abnormality is seen .
    OUTPUT:
    
Mild pulmonary vascular congestion . Patchy bibasilar opacities are likely reflective of atelectasis , but infection is not completely excluded .