Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . Heart size is normal . The mediastinal and hilar contours are unremarkable . Crowding of bronchovascular structures is present without overt pulmonary edema . Patchy opacities are noted in the lung bases , more so on the left , which may reflect atelectasis , but infection is not excluded in the correct clinical setting . There may be trace bilateral pleural effusions . No pneumothorax is identified . There mild degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Patchy opacities in lung bases may reflect atelectasis but infection is not excluded in the correct clinical setting . Possible trace bilateral pleural effusions .