Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are unchanged , was similar enlargement of the hilar regions bilaterally . Lung volumes are low with patchy opacity in the lung bases likely reflective of atelectasis . There may be mild pulmonary vascular engorgement without overt pulmonary edema . No large pleural effusion or pneumothorax is present . Widening of the right AC joint is unchanged , and may be postsurgical .
    OUTPUT:
    
Low lung volumes with patchy opacities the lung bases , potentially atelectasis , but infection can not be excluded . Probable mild pulmonary vascular congestion .