Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged , as seen on the previous study . The mediastinal contour is grossly unremarkable . Crowding of bronchovascular structures is demonstrated without overt pulmonary edema . Patchy opacities in the lung bases may reflect atelectasis in the setting of low lung volumes . No definite focal consolidation , pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with patchy bibasilar airspace opacities potentially reflecting atelectasis . Infection however can not be completely excluded in the correct clinical setting .