Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size remains at least mildly enlarged with a left ventricular predominance . The mediastinal contour is unremarkable . Crowding of bronchovascular structures is present without pulmonary edema . Elevation of the right hemidiaphragm is unchanged . Patchy opacities in the lung bases likely reflect areas of atelectasis . No pleural effusion or pneumothorax is present . There are mild to moderate degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Low lung volumes with patchy bibasilar airspace opacities likely reflective of atelectasis . No pulmonary edema .