Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size appears mildly enlarged . Lung volumes are low . Aorta remains tortuous . Hilar contours are relatively unchanged . There is crowding of bronchovascular structures as result of low lung volumes , without definite evidence for overt pulmonary edema . Bibasilar airspace opacities are noted , more pronounced in the retrocardiac region , findings which could reflect atelectasis , but infection or aspiration is not excluded in the correct clinical setting . The right costophrenic angle is excluded from the examination . No large pleural effusion or pneumothorax is identified allowing for this .
    OUTPUT:
    
Low lung volumes . Patchy opacities in the lung bases , more pronounced within retrocardiac region , may reflect atelectasis however aspiration or infection can not be excluded in the correct clinical setting .